Vulnerability-Lookup

FKIE_CVE-2021-36934

Vulnerability from fkie_nvd - Published: 2021-07-22 07:15 - Updated: 2026-08-10 20:19

Severity

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

Summary

An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.

References

URL	Tags
secure@microsoft.com	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html	Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108	https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934	Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://www.kb.cert.org/vuls/id/506989	Third Party Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934	US Government Resource

Impacted products

Vendor	Product	Version
microsoft	windows_10_1809	*
microsoft	windows_10_1909	*
microsoft	windows_10_2004	*
microsoft	windows_10_20h2	*
microsoft	windows_10_21h1	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1809",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.2114",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "ARM64-based Systems"
          ],
          "product": "Windows 10 Version 1809",
          "vendor": "Microsoft",
          "versions": [
            {
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              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1909",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.18363.1734",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 2004",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19041.1165",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems"
          ],
          "product": "Windows 10 Version 20H2",
          "vendor": "Microsoft",
          "versions": [
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              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
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          ],
          "product": "Windows 10 Version 21H1",
          "vendor": "Microsoft",
          "versions": [
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              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "secure@microsoft.com"
    }
  ],
  "cisaActionDue": "2022-02-24",
  "cisaExploitAdd": "2022-02-10",
  "cisaRequiredAction": "Apply updates per vendor instructions.",
  "cisaVulnerabilityName": "Microsoft Windows SAM Local Privilege Escalation Vulnerability",
  "configurations": [
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  ],
  "cveTags": [],
  "descriptions": [
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      "lang": "en",
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    },
    {
      "lang": "es",
      "value": "Una Vulnerabilidad de Elevaci\u00f3n de Privilegios en Windows"
    }
  ],
  "id": "CVE-2021-36934",
  "lastModified": "2026-08-10T20:19:00.610",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.6,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:L/Au:N/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "baseScore": 7.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      },
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          "integrityImpact": "HIGH",
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        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Secondary"
      }
    ],
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          "options": [
            {
              "exploitation": "active"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-04T18:15:10.079347Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-07-22T07:15:11.013",
  "references": [
    {
      "source": "secure@microsoft.com",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
      "url": "https://www.kb.cert.org/vuls/id/506989"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
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      ],
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-36934"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
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      ],
      "source": "nvd@nist.gov",
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  ]
}

CVE-2021-36934 (GCVE-0-2021-36934)

Vulnerability from cvelistv5 – Published: 2021-07-22 07:05 – Updated: 2026-08-10 15:11

Title

Windows Elevation of Privilege Vulnerability

Summary

Severity

7.8 (High)


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

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-02-04 18:15 UTC

CWE

Elevation of Privilege
CWE-noinfo Not enough information

Assigner

microsoft mitre root

References

5 references

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch
https://www.kb.cert.org/vuls/id/506989
https://portal.msrc.microsoft.com/en-US/security-…	x_refsource_MISCx_transferred
http://packetstormsecurity.com/files/164006/HiveN…	x_refsource_MISCx_transferred
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

6 products

Vendor	Product	Version
Microsoft	Windows 10 Version 1809	Affected: 10.0.17763.0 , < 10.0.17763.2114 (custom)
Microsoft	Windows 10 Version 1809	Affected: 10.0.0 , < 10.0.17763.2114 (custom)
Microsoft	Windows 10 Version 1909	Affected: 10.0.0 , < 10.0.18363.1734 (custom)
Microsoft	Windows 10 Version 2004	Affected: 10.0.0 , < 10.0.19041.1165 (custom)
Microsoft	Windows 10 Version 20H2	Affected: 10.0.0 , < 10.0.19042.1165 (custom)
Microsoft	Windows 10 Version 21H1	Affected: 10.0.0 , < 10.0.19043.1165 (custom)

Date Public

2021-07-20 14:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T01:09:06.213Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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            "url": "http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html"
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        "title": "CVE Program Container"
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  "dataType": "CVE_RECORD",
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}

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

FKIE_CVE-2021-36934

CVE-2021-36934 (GCVE-0-2021-36934)

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