CVE-2021-43226

Timeline

Detection, updates, and resolution for this record.

1. Dec 15, 2021 · Catalog

   Detected

   Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

2. Oct 6, 2025 · CISA KEV

   Known exploited

   Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

3. Oct 27, 2025 · CISA KEV

   Remediation due

   Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

4. Aug 21, 2026 · Catalog

   Updated

   Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

Affected

• cpe microsoft/windows 10 1507version unspecified
• cpe microsoft/windows 10 1607version unspecified
• cpe microsoft/windows 10 1809version unspecified
• cpe microsoft/windows 10 1909version unspecified
• cpe microsoft/windows 10 2004version unspecified
• cpe microsoft/windows 10 20h2version unspecified
• vendor Microsoft Windowsversion unspecified

Sources

• CISA KEVCVE-2021-43226

  Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

  cisa.gov
• CVE.orgCVE-2021-43226

  Official CVE identifier

  cve.org
• FIRST EPSSCVE-2021-43226

  30-day exploitation probability 3.3%

  first.org
• NIST NVDCVE-2021-43226

  Windows Common Log File System Driver Elevation of Privilege Vulnerability

  nvd.nist.gov

References

• CISA note · msrc.microsoft.com
• CISA note · nvd.nist.gov
• Patch · portal.msrc.microsoft.com
• US Government Resource · cisa.gov