CVE-2021-43226 (GCVE-0-2021-43226)

Vulnerability from cvelistv5 – Published: 2021-12-15 14:15 – Updated: 2025-10-21 23:25
VLAI?
Title
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Summary
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CWE
  • Elevation of Privilege
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1809 Affected: 10.0.0 , < 10.0.17763.2366 (custom)
    cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2366:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2366:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.17763.2366:*:*:*:*:*:arm64:*
 Create a notification for this product.
    Microsoft Windows Server 2019 Affected: 10.0.0 , < 10.0.17763.2366 (custom)
    cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2366:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.0 , < 10.0.17763.2366 (custom)
    cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2366:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows 10 Version 1909 Affected: 10.0.0 , < 10.0.18363.1977 (custom)
    cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1977:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1977:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1977:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows 10 Version 21H1 Affected: 10.0.0 , < 10.0.19043.1415 (custom)
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1415:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1415:*:*:*:*:*:arm64:*
    cpe:2.3:o:microsoft:windows_10_21H1:10.0.19043.1415:*:*:*:*:*:x86:*
 Create a notification for this product.
    Microsoft Windows Server 2022 Affected: 10.0.0 , < 10.0.20348.405 (custom)
    cpe:2.3:o:microsoft:windows_server_2022:10.0.20348.405:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows 10 Version 2004 Affected: 10.0.0 , < 10.0.19041.1415 (custom)
    cpe:2.3:o:microsoft:windows_10_1809:10.0.19041.1415:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server version 2004 Affected: 10.0.0 , < 10.0.19041.1415 (custom)
    cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1415:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows 10 Version 20H2 Affected: 10.0.0 , < 10.0.19042.1415 (custom)
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1415:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_20H2:10.0.19042.1415:*:*:*:*:*:arm64:*
 Create a notification for this product.
    Microsoft Windows Server version 20H2 Affected: 10.0.0 , < 10.0.19042.1415 (custom)
    cpe:2.3:o:microsoft:windows_server_20H2:10.0.19042.1415:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows 11 version 21H2 Affected: 10.0.0 , < 10.0.22000.376 (custom)
    cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.376:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_11_21H2:10.0.22000.376:*:*:*:*:*:arm64:*
 Create a notification for this product.
    Microsoft Windows 10 Version 21H2 Affected: 10.0.0 , < 10.0.19044.1415 (custom)
    cpe:2.3:o:microsoft:windows_10_21H2:10.0.19044.1415:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_21H2:10.0.19044.1415:*:*:*:*:*:arm64:*
    cpe:2.3:o:microsoft:windows_10_21H2:10.0.19044.1415:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows 10 Version 1507 Affected: 10.0.0 , < 10.0.10240.19145 (custom)
    cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19145:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1507:10.0.10240.19145:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows 10 Version 1607 Affected: 10.0.0 , < 10.0.14393.4825 (custom)
    cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4825:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_10_1607:10.0.14393.4825:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2016 Affected: 10.0.0 , < 10.0.14393.4825 (custom)
    cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4825:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.0 , < 10.0.14393.4825 (custom)
    cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4825:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows 7 Affected: 6.1.0 , < 6.1.7601.25796 (custom)
    cpe:2.3:o:microsoft:windows_7:6.1.7601.25796:sp1:*:*:*:*:x86:*
 Create a notification for this product.
    Microsoft Windows 7 Service Pack 1 Affected: 6.1.0 , < 6.1.7601.25796 (custom)
    cpe:2.3:o:microsoft:windows_7:6.1.7601.25796:sp1:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows 8.1 Affected: 6.3.0 , < 6.3.9600.20207 (custom)
    cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20207:*:*:*:*:*:x86:*
    cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20207:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20207:*:*:*:*:*:*:*
 Create a notification for this product.
    Microsoft Windows Server 2008 Service Pack 2 Affected: 6.0.0 , < 6.0.6003.21309 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) Affected: 6.0.0 , < 6.0.6003.21309 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x86:*
 Create a notification for this product.
    Microsoft Windows Server 2008 Service Pack 2 Affected: 6.0.0 , < 6.0.6003.21309 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x86:*
 Create a notification for this product.
    Microsoft Windows Server 2008 R2 Service Pack 1 Affected: 6.1.0 , < 6.1.7601.25796 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25796:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) Affected: 6.0.0 , < 6.1.7601.25796 (custom)
    cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25796:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2012 Affected: 6.2.0 , < 6.2.9200.23545 (custom)
Affected: 6.2.0 , < 6.2.9200.23540 (custom)
    cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23545:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23540:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.0 , < 6.2.9200.23545 (custom)
Affected: 6.2.0 , < 6.2.9200.23540 (custom)
    cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23545:*:*:*:*:*:x64:*
    cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23540:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2012 R2 Affected: 6.3.0 , < 6.3.9600.20207 (custom)
    cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20207:*:*:*:*:*:x64:*
 Create a notification for this product.
    Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.0 , < 6.3.9600.20207 (custom)
    cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20207:*:*:*:*:*:x64:*
 Create a notification for this product.
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            "cpe:2.3:o:microsoft:windows_10_1909:10.0.18363.1977:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_10_1809:10.0.18363.1977:*:*:*:*:*:x64:*"
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              "lessThan": "10.0.14393.4825",
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        },
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          "platforms": [
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          ],
          "product": "Windows 7",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.1.7601.25796",
              "status": "affected",
              "version": "6.1.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_7:6.1.7601.25796:sp1:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows 7 Service Pack 1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.1.7601.25796",
              "status": "affected",
              "version": "6.1.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20207:*:*:*:*:*:x86:*",
            "cpe:2.3:o:microsoft:windows_8.1:6.3.9600.20207:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_rt_8.1:6.3.9600.20207:*:*:*:*:*:*:*"
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems",
            "ARM64-based Systems"
          ],
          "product": "Windows 8.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.20207",
              "status": "affected",
              "version": "6.3.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "32-bit Systems"
          ],
          "product": "Windows Server 2008 Service Pack 2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.0.6003.21309",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x86:*"
          ],
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows Server 2008 Service Pack 2 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.0.6003.21309",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21309:*:*:*:*:*:x86:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2008  Service Pack 2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.0.6003.21309",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25796:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2008 R2 Service Pack 1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.1.7601.25796",
              "status": "affected",
              "version": "6.1.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25796:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.1.7601.25796",
              "status": "affected",
              "version": "6.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23545:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23540:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.2.9200.23545",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "custom"
            },
            {
              "lessThan": "6.2.9200.23540",
              "status": "affected",
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              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23545:*:*:*:*:*:x64:*",
            "cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23540:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.2.9200.23545",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "custom"
            },
            {
              "lessThan": "6.2.9200.23540",
              "status": "affected",
              "version": "6.2.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20207:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 R2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.20207",
              "status": "affected",
              "version": "6.3.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "cpes": [
            "cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20207:*:*:*:*:*:x64:*"
          ],
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 R2 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.20207",
              "status": "affected",
              "version": "6.3.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "datePublic": "2021-12-14T08:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Windows Common Log File System Driver Elevation of Privilege Vulnerability"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "Elevation of Privilege",
              "lang": "en-US",
              "type": "Impact"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-05-29T14:44:20.762Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-43226"
        }
      ],
      "title": "Windows Common Log File System Driver Elevation of Privilege Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2021-43226",
    "datePublished": "2021-12-15T14:15:12.000Z",
    "dateReserved": "2021-11-02T00:00:00.000Z",
    "dateUpdated": "2025-10-21T23:25:22.540Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "cisa_known_exploited": {
      "cveID": "CVE-2021-43226",
      "dateAdded": "2025-10-06",
      "dueDate": "2025-10-27",
      "knownRansomwareCampaignUse": "Unknown",
      "notes": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43226 ; https://nvd.nist.gov/vuln/detail/CVE-2021-43226",
      "product": "Windows",
      "requiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
      "shortDescription": "Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.",
      "vendorProject": "Microsoft",
      "vulnerabilityName": "Microsoft Windows Privilege Escalation Vulnerability"
    }
  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.