Vulnerability-Lookup

VAR-202108-1026

Vulnerability from variot - Updated: 2024-01-03 12:07

.NET Core and Visual Studio Denial of Service Vulnerability. plural Microsoft The product interferes with service operation (DoS) A vulnerability exists.Denial of service (DoS) It may be put into a state. Pillow is a Python-based image processing library. There is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

===================================================================== Red Hat Security Advisory

Synopsis: Important: .NET Core 3.1 on RHEL 7 security and bugfix update Advisory ID: RHSA-2021:3143-01 Product: .NET Core on Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2021:3143 Issue date: 2021-08-11 CVE Names: CVE-2021-26423 CVE-2021-34485 CVE-2021-34532 =====================================================================

Summary:

An update for .NET Core 3.1 is now available for .NET Core on Red Hat Enterprise Linux.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Relevant releases/architectures:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64 .NET Core on Red Hat Enterprise Linux Server (v. 7) - x86_64 .NET Core on Red Hat Enterprise Linux Workstation (v. 7) - x86_64

Description:

.NET is a managed-software framework. It implements a subset of the .NET framework APIs and several new APIs, and it includes a CLR implementation.

New versions of .NET that address security vulnerabilities are now available. The updated versions are .NET SDK 3.1.118 and .NET Runtime 3.1.18.

Security Fix(es):

dotnet: ASP.NET Core WebSocket frame processing DoS (CVE-2021-26423)
dotnet: Dump file created world-readable (CVE-2021-34485)
dotnet: ASP.NET Core JWT token logging (CVE-2021-34532)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Bugs fixed (https://bugzilla.redhat.com/):

1990286 - CVE-2021-34485 dotnet: Dump file created world-readable 1990295 - CVE-2021-26423 dotnet: ASP.NET Core WebSocket frame processing DoS 1990300 - CVE-2021-34532 dotnet: ASP.NET Core JWT token logging

Package List:

.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7):

Source: rh-dotnet31-dotnet-3.1.118-1.el7_9.src.rpm

x86_64: rh-dotnet31-aspnetcore-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-3.1.118-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-apphost-pack-3.1-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-debuginfo-3.1.118-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-host-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-hostfxr-3.1-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-sdk-3.1-3.1.118-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm rh-dotnet31-dotnet-templates-3.1-3.1.118-1.el7_9.x86_64.rpm rh-dotnet31-netstandard-targeting-pack-2.1-3.1.118-1.el7_9.x86_64.rpm

.NET Core on Red Hat Enterprise Linux Server (v. 7):

Source: rh-dotnet31-dotnet-3.1.118-1.el7_9.src.rpm

.NET Core on Red Hat Enterprise Linux Workstation (v. 7):

Source: rh-dotnet31-dotnet-3.1.118-1.el7_9.src.rpm

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

References:

https://access.redhat.com/security/cve/CVE-2021-26423 https://access.redhat.com/security/cve/CVE-2021-34485 https://access.redhat.com/security/cve/CVE-2021-34532 https://access.redhat.com/security/updates/classification/#important

Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

iQIVAwUBYRQa8tzjgjWX9erEAQgZVg//eyD52RIjaXDx3Y8hIiT3Lol1bgP5prfh vgB+Y/IX75XF929mfsAP4QYJGQR9Q6OR511V7SewOqlGMO65S6yvlqVjvDCoesFc Am02/u2D3A8U7HiTYmAPqKNwzf7t8v2KbfZGMIAJQgYCEB4qjT2zvIt9B6TRAKo2 EdQa4XQsnmh4h3bMhkLrI3m8epxUD5Fk7RizA2F7pCwyL/EpiGzlD13nQWNB18gC Y8Csf5i+xPa66EakBo1fWb7u8oda1aoDcKSoDqinfd9t29yTNCAN4g2h1P/1TkDi nLpFRYf5fv7hoWUHmzg6Alp3eZw2GJVVvtMok2bba2TRYmw3MuXuxctaghupD8ph WDtluNCVniryl4SDkgFaSutcAwbyVlQo6M+ku5j1oy+nS26boGv0dIet9UHHkcAS /+tEiTw/atMuRLwkEQ90Y+CUQ9EkTW9X0haKTsvqbJ+/ZKiDdBYQlYxnrvzh5NEx L/a+QneLNviwEJsyFwozWePokB70J1sPPlU2TjtJI7X5hehvIg1U7rfIGSW7yAmB ji512gGjxX6p/k98O2+1DNJ9c8zf6CvHEt+A2KKaZHkJDV/J5aZeJzfmT3rSq+qu 6BQTTYOtPEI7m/u20I5zzeJ1MBE0gE31O+ng3trHf4HzN82T9AZKB0lthLiX4TKK 3V5TkyNr+k0= =JpAp -----END PGP SIGNATURE-----

-- RHSA-announce mailing list RHSA-announce@redhat.com https://listman.redhat.com/mailman/listinfo/rhsa-announce

Show details on source website

JSON

To clipboard

{
  "@context": {
    "@vocab": "https://www.variotdbs.pl/ref/VARIoTentry#",
    "affected_products": {
      "@id": "https://www.variotdbs.pl/ref/affected_products"
    },
    "configurations": {
      "@id": "https://www.variotdbs.pl/ref/configurations"
    },
    "credits": {
      "@id": "https://www.variotdbs.pl/ref/credits"
    },
    "cvss": {
      "@id": "https://www.variotdbs.pl/ref/cvss/"
    },
    "description": {
      "@id": "https://www.variotdbs.pl/ref/description/"
    },
    "exploit_availability": {
      "@id": "https://www.variotdbs.pl/ref/exploit_availability/"
    },
    "external_ids": {
      "@id": "https://www.variotdbs.pl/ref/external_ids/"
    },
    "iot": {
      "@id": "https://www.variotdbs.pl/ref/iot/"
    },
    "iot_taxonomy": {
      "@id": "https://www.variotdbs.pl/ref/iot_taxonomy/"
    },
    "patch": {
      "@id": "https://www.variotdbs.pl/ref/patch/"
    },
    "problemtype_data": {
      "@id": "https://www.variotdbs.pl/ref/problemtype_data/"
    },
    "references": {
      "@id": "https://www.variotdbs.pl/ref/references/"
    },
    "sources": {
      "@id": "https://www.variotdbs.pl/ref/sources/"
    },
    "sources_release_date": {
      "@id": "https://www.variotdbs.pl/ref/sources_release_date/"
    },
    "sources_update_date": {
      "@id": "https://www.variotdbs.pl/ref/sources_update_date/"
    },
    "threat_type": {
      "@id": "https://www.variotdbs.pl/ref/threat_type/"
    },
    "title": {
      "@id": "https://www.variotdbs.pl/ref/title/"
    },
    "type": {
      "@id": "https://www.variotdbs.pl/ref/type/"
    }
  },
  "@id": "https://www.variotdbs.pl/vuln/VAR-202108-1026",
  "affected_products": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/affected_products#",
      "data": {
        "@container": "@list"
      },
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        },
        "@id": "https://www.variotdbs.pl/ref/sources"
      }
    },
    "data": [
      {
        "model": ".net",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "5.0"
      },
      {
        "model": ".net core",
        "scope": "lte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "2.1.28"
      },
      {
        "model": "visual studio 2019",
        "scope": "lte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "16.10"
      },
      {
        "model": ".net core",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "3.1"
      },
      {
        "model": "visual studio 2017",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "15.0"
      },
      {
        "model": "visual studio 2019",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "16.0"
      },
      {
        "model": ".net core",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "2.1"
      },
      {
        "model": "powershell core",
        "scope": "lt",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "7.0.7"
      },
      {
        "model": ".net",
        "scope": "lte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "5.0.8"
      },
      {
        "model": "powershell core",
        "scope": "lt",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "7.1.4"
      },
      {
        "model": ".net core",
        "scope": "lte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "3.1.17"
      },
      {
        "model": "powershell core",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "7.1"
      },
      {
        "model": "powershell core",
        "scope": "gte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "7.0"
      },
      {
        "model": "visual studio 2017",
        "scope": "lte",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "15.9"
      },
      {
        "model": "visual studio 2019",
        "scope": "eq",
        "trust": 1.0,
        "vendor": "microsoft",
        "version": "8.10"
      },
      {
        "model": "powershell core",
        "scope": "eq",
        "trust": 0.8,
        "vendor": "\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8",
        "version": "7.1"
      },
      {
        "model": ".net",
        "scope": null,
        "trust": 0.8,
        "vendor": "\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8",
        "version": null
      },
      {
        "model": "microsoft visual studio",
        "scope": null,
        "trust": 0.8,
        "vendor": "\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8",
        "version": null
      },
      {
        "model": "powershell core",
        "scope": "eq",
        "trust": 0.8,
        "vendor": "\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8",
        "version": "7.0"
      },
      {
        "model": ".net core",
        "scope": null,
        "trust": 0.8,
        "vendor": "\u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8",
        "version": null
      }
    ],
    "sources": [
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      }
    ]
  },
  "configurations": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/configurations#",
      "children": {
        "@container": "@list"
      },
      "cpe_match": {
        "@container": "@list"
      },
      "data": {
        "@container": "@list"
      },
      "nodes": {
        "@container": "@list"
      }
    },
    "data": [
      {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "15.9",
                "versionStartIncluding": "15.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "16.10",
                "versionStartIncluding": "16.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:visual_studio_2019:8.10:*:*:*:*:macos:*:*",
                "cpe_name": [],
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "5.0.8",
                "versionStartIncluding": "5.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "2.1.28",
                "versionStartIncluding": "2.1",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndIncluding": "3.1.17",
                "versionStartIncluding": "3.1",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "7.0.7",
                "versionStartIncluding": "7.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "7.1.4",
                "versionStartIncluding": "7.1",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      }
    ],
    "sources": [
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      }
    ]
  },
  "credits": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/credits#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": "Peter St\u00f6ckli\u003c/a\u003e with Ergon Informatik",
    "sources": [
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ],
    "trust": 0.6
  },
  "cve": "CVE-2021-26423",
  "cvss": {
    "@context": {
      "cvssV2": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/cvss/cvssV2#"
        },
        "@id": "https://www.variotdbs.pl/ref/cvss/cvssV2"
      },
      "cvssV3": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/cvss/cvssV3#"
        },
        "@id": "https://www.variotdbs.pl/ref/cvss/cvssV3/"
      },
      "severity": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/cvss/severity#"
        },
        "@id": "https://www.variotdbs.pl/ref/cvss/severity"
      },
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        },
        "@id": "https://www.variotdbs.pl/ref/sources"
      }
    },
    "data": [
      {
        "cvssV2": [
          {
            "acInsufInfo": false,
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "author": "NVD",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "exploitabilityScore": 10.0,
            "impactScore": 2.9,
            "integrityImpact": "NONE",
            "obtainAllPrivilege": false,
            "obtainOtherPrivilege": false,
            "obtainUserPrivilege": false,
            "severity": "MEDIUM",
            "trust": 1.0,
            "userInteractionRequired": false,
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          {
            "acInsufInfo": null,
            "accessComplexity": "Low",
            "accessVector": "Network",
            "authentication": "None",
            "author": "NVD",
            "availabilityImpact": "Partial",
            "baseScore": 5.0,
            "confidentialityImpact": "None",
            "exploitabilityScore": null,
            "id": "CVE-2021-26423",
            "impactScore": null,
            "integrityImpact": "None",
            "obtainAllPrivilege": null,
            "obtainOtherPrivilege": null,
            "obtainUserPrivilege": null,
            "severity": "Medium",
            "trust": 0.9,
            "userInteractionRequired": null,
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          }
        ],
        "cvssV3": [
          {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "author": "NVD",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "exploitabilityScore": 3.9,
            "impactScore": 3.6,
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "trust": 2.0,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          {
            "attackComplexity": "Low",
            "attackVector": "Network",
            "author": "NVD",
            "availabilityImpact": "High",
            "baseScore": 7.5,
            "baseSeverity": "High",
            "confidentialityImpact": "None",
            "exploitabilityScore": null,
            "id": "CVE-2021-26423",
            "impactScore": null,
            "integrityImpact": "None",
            "privilegesRequired": "None",
            "scope": "Unchanged",
            "trust": 0.8,
            "userInteraction": "None",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.0"
          }
        ],
        "severity": [
          {
            "author": "NVD",
            "id": "CVE-2021-26423",
            "trust": 1.8,
            "value": "HIGH"
          },
          {
            "author": "secure@microsoft.com",
            "id": "CVE-2021-26423",
            "trust": 1.0,
            "value": "HIGH"
          },
          {
            "author": "CNNVD",
            "id": "CNNVD-202104-975",
            "trust": 0.6,
            "value": "MEDIUM"
          },
          {
            "author": "CNNVD",
            "id": "CNNVD-202108-847",
            "trust": 0.6,
            "value": "HIGH"
          },
          {
            "author": "VULMON",
            "id": "CVE-2021-26423",
            "trust": 0.1,
            "value": "MEDIUM"
          }
        ]
      }
    ],
    "sources": [
      {
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "description": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/description#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": ".NET Core and Visual Studio Denial of Service Vulnerability. plural Microsoft The product interferes with service operation (DoS) A vulnerability exists.Denial of service (DoS) It may be put into a state. Pillow is a Python-based image processing library. \nThere is currently no information about this vulnerability, please feel free to follow CNNVD or manufacturer announcements. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n=====================================================================\n                   Red Hat Security Advisory\n\nSynopsis:          Important: .NET Core 3.1 on RHEL 7 security and bugfix update\nAdvisory ID:       RHSA-2021:3143-01\nProduct:           .NET Core on Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2021:3143\nIssue date:        2021-08-11\nCVE Names:         CVE-2021-26423 CVE-2021-34485 CVE-2021-34532 \n=====================================================================\n\n1. Summary:\n\nAn update for .NET Core 3.1 is now available for .NET Core on Red Hat\nEnterprise Linux. \n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\n.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64\n.NET Core on Red Hat Enterprise Linux Server (v. 7) - x86_64\n.NET Core on Red Hat Enterprise Linux Workstation (v. 7) - x86_64\n\n3. Description:\n\n.NET is a managed-software framework. It implements a subset of the .NET\nframework APIs and several new APIs, and it includes a CLR implementation. \n\nNew versions of .NET that address security vulnerabilities are now\navailable. The updated versions are .NET SDK 3.1.118 and .NET Runtime\n3.1.18. \n\nSecurity Fix(es):\n\n* dotnet: ASP.NET Core WebSocket frame processing DoS (CVE-2021-26423)\n\n* dotnet: Dump file created world-readable (CVE-2021-34485)\n\n* dotnet: ASP.NET Core JWT token logging (CVE-2021-34532)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1990286 - CVE-2021-34485 dotnet: Dump file created world-readable\n1990295 - CVE-2021-26423 dotnet: ASP.NET Core WebSocket frame processing DoS\n1990300 - CVE-2021-34532 dotnet: ASP.NET Core JWT token logging\n\n6. Package List:\n\n.NET Core on Red Hat Enterprise Linux ComputeNode (v. 7):\n\nSource:\nrh-dotnet31-dotnet-3.1.118-1.el7_9.src.rpm\n\nx86_64:\nrh-dotnet31-aspnetcore-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-apphost-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-debuginfo-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-host-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-hostfxr-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-sdk-3.1-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-templates-3.1-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-netstandard-targeting-pack-2.1-3.1.118-1.el7_9.x86_64.rpm\n\n.NET Core on Red Hat Enterprise Linux Server (v. 7):\n\nSource:\nrh-dotnet31-dotnet-3.1.118-1.el7_9.src.rpm\n\nx86_64:\nrh-dotnet31-aspnetcore-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-apphost-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-debuginfo-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-host-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-hostfxr-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-sdk-3.1-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-templates-3.1-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-netstandard-targeting-pack-2.1-3.1.118-1.el7_9.x86_64.rpm\n\n.NET Core on Red Hat Enterprise Linux Workstation (v. 7):\n\nSource:\nrh-dotnet31-dotnet-3.1.118-1.el7_9.src.rpm\n\nx86_64:\nrh-dotnet31-aspnetcore-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-aspnetcore-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-apphost-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-debuginfo-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-host-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-hostfxr-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-runtime-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-sdk-3.1-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-targeting-pack-3.1-3.1.18-1.el7_9.x86_64.rpm\nrh-dotnet31-dotnet-templates-3.1-3.1.118-1.el7_9.x86_64.rpm\nrh-dotnet31-netstandard-targeting-pack-2.1-3.1.118-1.el7_9.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2021-26423\nhttps://access.redhat.com/security/cve/CVE-2021-34485\nhttps://access.redhat.com/security/cve/CVE-2021-34532\nhttps://access.redhat.com/security/updates/classification/#important\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2021 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\n3V5TkyNr+k0=\n=JpAp\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://listman.redhat.com/mailman/listinfo/rhsa-announce\n",
    "sources": [
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "db": "PACKETSTORM",
        "id": "163808"
      },
      {
        "db": "PACKETSTORM",
        "id": "163807"
      },
      {
        "db": "PACKETSTORM",
        "id": "163802"
      },
      {
        "db": "PACKETSTORM",
        "id": "163799"
      }
    ],
    "trust": 2.61
  },
  "external_ids": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/external_ids#",
      "data": {
        "@container": "@list"
      },
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": [
      {
        "db": "NVD",
        "id": "CVE-2021-26423",
        "trust": 2.9
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313",
        "trust": 0.8
      },
      {
        "db": "PACKETSTORM",
        "id": "163799",
        "trust": 0.7
      },
      {
        "db": "CS-HELP",
        "id": "SB2021041363",
        "trust": 0.6
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975",
        "trust": 0.6
      },
      {
        "db": "AUSCERT",
        "id": "ESB-2021.2729",
        "trust": 0.6
      },
      {
        "db": "AUSCERT",
        "id": "ESB-2021.2753",
        "trust": 0.6
      },
      {
        "db": "CS-HELP",
        "id": "SB2021081011",
        "trust": 0.6
      },
      {
        "db": "CS-HELP",
        "id": "SB2021081229",
        "trust": 0.6
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847",
        "trust": 0.6
      },
      {
        "db": "VULMON",
        "id": "CVE-2021-26423",
        "trust": 0.1
      },
      {
        "db": "PACKETSTORM",
        "id": "163808",
        "trust": 0.1
      },
      {
        "db": "PACKETSTORM",
        "id": "163807",
        "trust": 0.1
      },
      {
        "db": "PACKETSTORM",
        "id": "163802",
        "trust": 0.1
      }
    ],
    "sources": [
      {
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "PACKETSTORM",
        "id": "163808"
      },
      {
        "db": "PACKETSTORM",
        "id": "163807"
      },
      {
        "db": "PACKETSTORM",
        "id": "163802"
      },
      {
        "db": "PACKETSTORM",
        "id": "163799"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "id": "VAR-202108-1026",
  "iot": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/iot#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": true,
    "sources": [
      {
        "db": "VARIoT devices database",
        "id": null
      }
    ],
    "trust": 0.21178882
  },
  "last_update_date": "2024-01-03T12:07:33.221000Z",
  "patch": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/patch#",
      "data": {
        "@container": "@list"
      },
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": [
      {
        "title": ".NET\u00a0Core\u00a0and\u00a0Visual\u00a0Studio\u00a0Denial\u00a0of\u00a0Service\u00a0Vulnerability Security Update Guide",
        "trust": 0.8,
        "url": "https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/cve-2021-26423"
      },
      {
        "title": "Microsoft .NET Core  and Microsoft Visual Studio Enter the fix for the verification error vulnerability",
        "trust": 0.6,
        "url": "http://www.cnnvd.org.cn/web/xxk/bdxqbyid.tag?id=159242"
      },
      {
        "title": "Red Hat: CVE-2021-26423",
        "trust": 0.1,
        "url": "https://vulmon.com/vendoradvisory?qidtp=red_hat_cve_database\u0026qid=cve-2021-26423"
      },
      {
        "title": "Arch Linux Issues: ",
        "trust": 0.1,
        "url": "https://vulmon.com/vendoradvisory?qidtp=arch_linux_issues\u0026qid=cve-2021-26423 log"
      }
    ],
    "sources": [
      {
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "problemtype_data": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/problemtype_data#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": [
      {
        "problemtype": "NVD-CWE-noinfo",
        "trust": 1.0
      },
      {
        "problemtype": "Lack of information (CWE-noinfo) [NVD Evaluation ]",
        "trust": 0.8
      }
    ],
    "sources": [
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      }
    ]
  },
  "references": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/references#",
      "data": {
        "@container": "@list"
      },
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": [
      {
        "trust": 1.7,
        "url": "https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/cve-2021-26423"
      },
      {
        "trust": 1.2,
        "url": "https://nvd.nist.gov/vuln/detail/cve-2021-26423"
      },
      {
        "trust": 1.1,
        "url": "https://access.redhat.com/security/cve/cve-2021-26423"
      },
      {
        "trust": 0.8,
        "url": "https://www.ipa.go.jp/security/ciadr/vul/20210811-ms.html"
      },
      {
        "trust": 0.8,
        "url": "https://www.jpcert.or.jp/at/2021/at210034.html"
      },
      {
        "trust": 0.6,
        "url": "https://www.cybersecurity-help.cz/vdb/sb2021041363"
      },
      {
        "trust": 0.6,
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/cve-2021-26423"
      },
      {
        "trust": 0.6,
        "url": "https://www.auscert.org.au/bulletins/esb-2021.2729"
      },
      {
        "trust": 0.6,
        "url": "https://www.auscert.org.au/bulletins/esb-2021.2753"
      },
      {
        "trust": 0.6,
        "url": "https://www.cybersecurity-help.cz/vdb/sb2021081229"
      },
      {
        "trust": 0.6,
        "url": "https://vigilance.fr/vulnerability/microsoft-visual-studio-vulnerabilities-of-august-2021-36113"
      },
      {
        "trust": 0.6,
        "url": "https://packetstormsecurity.com/files/163799/red-hat-security-advisory-2021-3142-01.html"
      },
      {
        "trust": 0.6,
        "url": "https://www.cybersecurity-help.cz/vdb/sb2021081011"
      },
      {
        "trust": 0.4,
        "url": "https://access.redhat.com/security/cve/cve-2021-34532"
      },
      {
        "trust": 0.4,
        "url": "https://listman.redhat.com/mailman/listinfo/rhsa-announce"
      },
      {
        "trust": 0.4,
        "url": "https://bugzilla.redhat.com/):"
      },
      {
        "trust": 0.4,
        "url": "https://access.redhat.com/security/team/key/"
      },
      {
        "trust": 0.4,
        "url": "https://nvd.nist.gov/vuln/detail/cve-2021-34532"
      },
      {
        "trust": 0.4,
        "url": "https://nvd.nist.gov/vuln/detail/cve-2021-34485"
      },
      {
        "trust": 0.4,
        "url": "https://access.redhat.com/articles/11258"
      },
      {
        "trust": 0.4,
        "url": "https://access.redhat.com/security/cve/cve-2021-34485"
      },
      {
        "trust": 0.4,
        "url": "https://access.redhat.com/security/team/contact/"
      },
      {
        "trust": 0.4,
        "url": "https://access.redhat.com/security/updates/classification/#important"
      },
      {
        "trust": 0.1,
        "url": "https://cwe.mitre.org/data/definitions/.html"
      },
      {
        "trust": 0.1,
        "url": "https://nvd.nist.gov"
      },
      {
        "trust": 0.1,
        "url": "https://access.redhat.com/errata/rhsa-2021:3148"
      },
      {
        "trust": 0.1,
        "url": "https://access.redhat.com/errata/rhsa-2021:3147"
      },
      {
        "trust": 0.1,
        "url": "https://access.redhat.com/errata/rhsa-2021:3143"
      },
      {
        "trust": 0.1,
        "url": "https://access.redhat.com/errata/rhsa-2021:3142"
      }
    ],
    "sources": [
      {
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "PACKETSTORM",
        "id": "163808"
      },
      {
        "db": "PACKETSTORM",
        "id": "163807"
      },
      {
        "db": "PACKETSTORM",
        "id": "163802"
      },
      {
        "db": "PACKETSTORM",
        "id": "163799"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "sources": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/sources#",
      "data": {
        "@container": "@list"
      }
    },
    "data": [
      {
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "db": "PACKETSTORM",
        "id": "163808"
      },
      {
        "db": "PACKETSTORM",
        "id": "163807"
      },
      {
        "db": "PACKETSTORM",
        "id": "163802"
      },
      {
        "db": "PACKETSTORM",
        "id": "163799"
      },
      {
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "sources_release_date": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/sources_release_date#",
      "data": {
        "@container": "@list"
      }
    },
    "data": [
      {
        "date": "2021-08-12T00:00:00",
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "date": "2021-08-26T00:00:00",
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "date": "2021-08-12T15:49:33",
        "db": "PACKETSTORM",
        "id": "163808"
      },
      {
        "date": "2021-08-12T15:49:21",
        "db": "PACKETSTORM",
        "id": "163807"
      },
      {
        "date": "2021-08-12T15:45:22",
        "db": "PACKETSTORM",
        "id": "163802"
      },
      {
        "date": "2021-08-12T15:43:32",
        "db": "PACKETSTORM",
        "id": "163799"
      },
      {
        "date": "2021-08-12T18:15:08.537000",
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "date": "2021-04-13T00:00:00",
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "date": "2021-08-10T00:00:00",
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "sources_update_date": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/sources_update_date#",
      "data": {
        "@container": "@list"
      }
    },
    "data": [
      {
        "date": "2021-08-19T00:00:00",
        "db": "VULMON",
        "id": "CVE-2021-26423"
      },
      {
        "date": "2021-08-26T03:18:00",
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      },
      {
        "date": "2023-12-28T20:15:44.377000",
        "db": "NVD",
        "id": "CVE-2021-26423"
      },
      {
        "date": "2021-04-14T00:00:00",
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      },
      {
        "date": "2021-08-20T00:00:00",
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ]
  },
  "threat_type": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/threat_type#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": "remote",
    "sources": [
      {
        "db": "CNNVD",
        "id": "CNNVD-202108-847"
      }
    ],
    "trust": 0.6
  },
  "title": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/title#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": "plural \u00a0Microsoft\u00a0 Service operation interruption in the product \u00a0(DoS)\u00a0 Vulnerability",
    "sources": [
      {
        "db": "JVNDB",
        "id": "JVNDB-2021-002313"
      }
    ],
    "trust": 0.8
  },
  "type": {
    "@context": {
      "@vocab": "https://www.variotdbs.pl/ref/type#",
      "sources": {
        "@container": "@list",
        "@context": {
          "@vocab": "https://www.variotdbs.pl/ref/sources#"
        }
      }
    },
    "data": "other",
    "sources": [
      {
        "db": "CNNVD",
        "id": "CNNVD-202104-975"
      }
    ],
    "trust": 0.6
  }
}

CVE-2021-26423 (GCVE-0-2021-26423)

Vulnerability from cvelistv5 – Published: 2021-08-12 18:11 – Updated: 2026-08-10 15:09

Title

.NET Core and Visual Studio Denial of Service Vulnerability

Summary

.NET Core and Visual Studio Denial of Service Vulnerability

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-06-04 13:28 UTC

CWE

Denial of Service
CWE-noinfo Not enough information

Assigner

microsoft mitre root Scorecard

References

2 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://portal.msrc.microsoft.com/en-US/security-…	x_refsource_MISCx_transferred

Impacted products

11 products

Vendor	Product	Version
Microsoft	.NET 5.0	Affected: 5.0.0 , < 5.0.9 (custom)
Microsoft	.NET Core 2.1	Affected: 2.1 , < 2.1.30 (custom)
Microsoft	.NET Core 3.1	Affected: 3.1 , < 3.1.18 (custom)
Microsoft	Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)	Affected: 15.9.0 , < 15.9.38 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)	Affected: 16.10.0 , < 16.10.5 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)	Affected: 16.0 , < 16.4.25 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.7 (includes 16.0 – 16.6)	Affected: 16.0.0 , < 16.7.18 (custom)
Microsoft	Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)	Affected: 15.0.0 , < 16.9.10 (custom)
Microsoft	PowerShell Core 7.0	Affected: 7.0.0 , < 7.0.7 (custom)
Microsoft	PowerShell Core 7.1	Affected: 7.1.0 , < 7.1.4 (custom)
Microsoft	Visual Studio 2019 for Mac version 8.10	Affected: 8.1.0 , < 8.10.7 (custom)

Date Public

2021-08-10 14:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T20:26:25.161Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26423"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-26423",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-06-04T13:28:43.832819Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-28T18:48:05.221Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": ".NET 5.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "5.0.9",
              "status": "affected",
              "version": "5.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": ".NET Core 2.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.1.30",
              "status": "affected",
              "version": "2.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": ".NET Core 3.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "3.1.18",
              "status": "affected",
              "version": "3.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2017 version 15.9 (includes 15.0 - 15.8)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "15.9.38",
              "status": "affected",
              "version": "15.9.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2019 version 16.10 (includes 16.0 - 16.9)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.10.5",
              "status": "affected",
              "version": "16.10.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2019 version 16.4 (includes 16.0 - 16.3)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.4.25",
              "status": "affected",
              "version": "16.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2019 version 16.7 (includes 16.0 \u2013 16.6)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.7.18",
              "status": "affected",
              "version": "16.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2019 version 16.9 (includes 16.0 - 16.8)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "16.9.10",
              "status": "affected",
              "version": "15.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "PowerShell Core 7.0",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "7.0.7",
              "status": "affected",
              "version": "7.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "PowerShell Core 7.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "7.1.4",
              "status": "affected",
              "version": "7.1.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Visual Studio 2019 for Mac version 8.10",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "8.10.7",
              "status": "affected",
              "version": "8.1.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2017:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "15.9.38",
                  "versionStartIncluding": "15.9.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.4.25",
                  "versionStartIncluding": "16.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.7.18",
                  "versionStartIncluding": "16.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.9.10",
                  "versionStartIncluding": "15.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "16.10.5",
                  "versionStartIncluding": "16.10.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:visual_studio_2019:*:*:*:*:*:macos:*:*",
                  "versionEndExcluding": "8.10.7",
                  "versionStartIncluding": "8.1.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "2.1.30",
                  "versionStartIncluding": "2.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:.net_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "3.1.18",
                  "versionStartIncluding": "3.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:.net:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.0.9",
                  "versionStartIncluding": "5.0.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.4",
                  "versionStartIncluding": "7.1.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:microsoft:powershell_core:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "7.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2021-08-10T14:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": ".NET Core and Visual Studio Denial of Service Vulnerability"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Denial of Service",
              "lang": "en-US",
              "type": "Impact"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-10T15:09:59.739Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": ".NET Core and Visual Studio Denial of Service Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26423"
        }
      ],
      "title": ".NET Core and Visual Studio Denial of Service Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2021-26423",
    "datePublished": "2021-08-12T18:11:31.000Z",
    "dateReserved": "2021-01-29T00:00:00.000Z",
    "dateUpdated": "2026-08-10T15:09:59.739Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

VAR-202108-1026

CVE-2021-26423 (GCVE-0-2021-26423)

Tags

Sightings

Nomenclature

Related by attack behaviour