Vulnerability-Lookup

CVE-2021-21373 (GCVE-0-2021-21373)

Vulnerability from cvelistv5 – Published: 2021-03-26 21:25 – Updated: 2024-08-03 18:09

Title

Nimble falls back to insecure http url when fetching packages

Summary

Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, "nimble refresh" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L

CWE

CWE-348 - Use of Less Trusted Source

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://consensys.net/diligence/vulnerabilities/n…	x_refsource_MISC
https://github.com/nim-lang/nimble/blob/master/ch…	x_refsource_MISC
https://github.com/nim-lang/security/security/adv…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
nim-lang	security	Affected: < 1.2.10 Affected: >= 1.4.0, < 1.4.4	guessed

Show details on NVD website

JSON

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    "redhat_vex": {
      "current_release_date": "2025-11-21T16:18:23+00:00",
      "cve": "CVE-2021-21373",
      "id": "CVE-2021-21373",
      "initial_release_date": "2021-03-27T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nim: \"nimble refresh\" falls back to a non-TLS URL in case of errror",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-21373.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2025-03-15T09:10:55Z",
      "cve": "CVE-2021-21373",
      "id": "CVE-2021-21373",
      "initial_release_date": "2023-02-15T03:46:17Z",
      "product_status:recommended": "7",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-21373",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-21373.json",
      "version": "6"
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  }
}

FKIE_CVE-2021-21373

Vulnerability from fkie_nvd - Published: 2021-03-26 22:15 - Updated: 2026-06-17 03:35

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/	Exploit, Third Party Advisory
security-advisories@github.com	https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130	Release Notes, Third Party Advisory
security-advisories@github.com	https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/	Exploit, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130	Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8	Third Party Advisory

Impacted products

	Vendor	Product	Version
	nim-lang	nim	*
	nim-lang	nim	*

JSON

To clipboard

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            {
              "criteria": "cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "FBDDF104-9FC9-4CED-9F87-26CF1DA2EF4E",
              "versionEndExcluding": "1.4.4",
              "versionStartIncluding": "1.4.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution."
    },
    {
      "lang": "es",
      "value": "Nimble es un administrador de paquetes para el lenguaje de programaci\u00f3n Nim.\u0026#xa0;En las versiones de lanzamiento de Nim anteriores a 1.2.10 y 1.4.4, la \"nimble refresh\" extrae una lista de paquetes de Nimble por medio de HTTPS por defecto.\u0026#xa0;En caso de error, recurre a una URL no TLS http://irclogs.nim-lang.org/packages.json.\u0026#xa0;Un atacante capaz de ejecutar MitM puede entregar una lista de paquetes modificada que contenga paquetes de software malicioso.\u0026#xa0;Si los paquetes son instalados y usados, el ataque se convierte en una ejecuci\u00f3n de c\u00f3digo que no es confiable."
    }
  ],
  "id": "CVE-2021-21373",
  "lastModified": "2026-06-17T03:35:24.930",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 5.3,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-03-26T22:15:12.773",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-348"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GSD-2021-21373

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-21373

Aliases

CVE-2021-21373

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-21373",
    "description": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.",
    "id": "GSD-2021-21373",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-21373.html",
      "https://security.archlinux.org/CVE-2021-21373"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-21373"
      ],
      "details": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.",
      "id": "GSD-2021-21373",
      "modified": "2023-12-13T01:23:10.897900Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security-advisories@github.com",
        "ID": "CVE-2021-21373",
        "STATE": "PUBLIC",
        "TITLE": "Nimble falls back to insecure http url when fetching packages"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "security",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "\u003c 1.2.10"
                        },
                        {
                          "version_value": "\u003e= 1.4.0, \u003c 1.4.4"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "nim-lang"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution."
          }
        ]
      },
      "impact": {
        "cvss": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-348 Use of Less Trusted Source"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/",
            "refsource": "MISC",
            "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
          },
          {
            "name": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130",
            "refsource": "MISC",
            "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
          },
          {
            "name": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8",
            "refsource": "CONFIRM",
            "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
          }
        ]
      },
      "source": {
        "advisory": "GHSA-8w52-r35x-rgp8",
        "discovery": "UNKNOWN"
      }
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.2.10",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:nim-lang:nim:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.4.4",
                "versionStartIncluding": "1.4.0",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-21373"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-295"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130",
              "refsource": "MISC",
              "tags": [
                "Release Notes",
                "Third Party Advisory"
              ],
              "url": "https://github.com/nim-lang/nimble/blob/master/changelog.markdown#0130"
            },
            {
              "name": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://github.com/nim-lang/security/security/advisories/GHSA-8w52-r35x-rgp8"
            },
            {
              "name": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/",
              "refsource": "MISC",
              "tags": [
                "Exploit",
                "Third Party Advisory"
              ],
              "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-03-31T15:52Z",
      "publishedDate": "2021-03-26T22:15Z"
    }
  }
}

OPENSUSE-SU-2021:0618-1

Vulnerability from csaf_opensuse - Published: 2021-04-25 18:05 - Updated: 2021-04-25 18:05

Summary

Security update for nim

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-21373.

CVE-2021-21373

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Recommended: 1 product

Open the full advisory

OPENSUSE-SU-2021:0628-1

Vulnerability from csaf_opensuse - Published: 2021-04-29 14:05 - Updated: 2021-04-29 14:05

Summary

Security update for nim

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-21373.

CVE-2021-21373

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Recommended: 2 products

Open the full advisory

OPENSUSE-SU-2022:10095-1

Vulnerability from csaf_opensuse - Published: 2022-08-24 02:33 - Updated: 2022-08-24 02:33

Summary

Security update for nim

Severity

Important

Scope

9 vulnerabilities in this advisory, including CVE-2021-21373.

CVE-2021-21373

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Recommended: 6 products

Open the full advisory

OPENSUSE-SU-2022:10101-1

Vulnerability from csaf_opensuse - Published: 2022-08-27 12:33 - Updated: 2022-08-27 12:33

Summary

Security update for nim

Severity

Important

Scope

9 vulnerabilities in this advisory, including CVE-2021-21373.

CVE-2021-21373

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Recommended: 6 products

Open the full advisory

OPENSUSE-SU-2024:11093-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

nim-1.2.12-1.7 on GA media

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2021-21373.

CVE-2021-21373

5.9 (Medium)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Recommended: 4 products

Open the full advisory

ubuntu-cve-2021-21373

Vulnerability from osv_ubuntu

Published

2021-03-26 22:15

Modified

2026-05-20 14:53

Summary

Details

Severity

7.5 (High)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L

5.9 (Medium)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-21373	REPORT
	https://consensys.net/diligence/vulnerabilities/n…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-21373	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nim",
            "binary_version": "0.12.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "nim",
        "purl": "pkg:deb/ubuntu/nim@0.12.0-2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.11.2+dfsg1-4",
        "0.12.0-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nim",
            "binary_version": "0.17.2-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "nim",
        "purl": "pkg:deb/ubuntu/nim@0.17.2-1ubuntu2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.17.2-1ubuntu1",
        "0.17.2-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nim",
            "binary_version": "1.0.6-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nim",
        "purl": "pkg:deb/ubuntu/nim@1.0.6-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.20.2-1",
        "1.0.2-1",
        "1.0.3~rc-1",
        "1.0.4-1",
        "1.0.6-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nim",
            "binary_version": "1.6.14-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "nim",
        "purl": "pkg:deb/ubuntu/nim@1.6.14-1ubuntu2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.14-1",
        "1.6.14-1ubuntu1",
        "1.6.14-1ubuntu2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nim",
            "binary_version": "2.2.4-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "nim",
        "purl": "pkg:deb/ubuntu/nim@2.2.4-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.14-1ubuntu2",
        "2.2.4-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "nim",
            "binary_version": "2.2.4-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "nim",
        "purl": "pkg:deb/ubuntu/nim@2.2.4-2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.4-1",
        "2.2.4-2"
      ]
    }
  ],
  "aliases": [],
  "details": "Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, \"nimble refresh\" fetches a list of Nimble packages over HTTPS by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.",
  "id": "UBUNTU-CVE-2021-21373",
  "modified": "2026-05-20T14:53:06Z",
  "published": "2021-03-26T22:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-21373"
    },
    {
      "type": "REPORT",
      "url": "https://consensys.net/diligence/vulnerabilities/nim-insecure-ssl-tls-defaults-remote-code-execution/"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-21373"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:H/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-21373"
  ]
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

CVE-2021-21373 (GCVE-0-2021-21373)

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature