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High7.8Microsoft Server

High [CVE-2021-38633] Windows Common Log File System Driver Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2021-38633 affecting Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2 (Server Core installation), Windows Server 2012 (Server Core installation).

CVE-2021-38633 Published Sep 15, 2021Updated by vendor Aug 10, 2026
CVE-2021-38633
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Affected products named by the advisory: Windows Server 2008 R2 Service Pack 1; Windows Server 2008 R2 Service Pack 1 (Server Core installation); Windows Server 2008 Service Pack 2; Windows Server 2008 Service Pack 2 (Server Core installation); and 11 more.

Affected products named by the advisory: Windows Server 2012 (Server Core installation); Windows Server 2012 R2 (Server Core installation); Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); and 3 more.

Affected versions
  • Windows 10 Version 1507 10.0.10240.0 before 10.0.10240.19060
  • Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.4651
  • Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.2183
  • Windows 10 Version 1809 10.0.0 before 10.0.17763.2183
  • Windows 10 Version 1909 10.0.0 before 10.0.18363.1801
  • Windows 10 Version 2004 10.0.0 before 10.0.19041.1237
  • Windows 10 Version 20H2 10.0.0 before 10.0.19042.1237
  • Windows 10 Version 21H1 10.0.0 before 10.0.19043.1237
  • Windows 7 6.1.0 before 6.1.7601.25712
  • Windows 7 Service Pack 1 6.1.0 before 6.1.7601.25712
  • Windows 8.1 6.3.0 before 6.3.9600.20120
  • Windows Server 2008 R2 Service Pack 1 6.1.7601.0 before 6.1.7601.25712

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Fixed versions
  • 10.0.10240.19060
  • 10.0.14393.4651
  • 10.0.17763.2183
  • 10.0.18363.1801
  • 10.0.19041.1237
  • 10.0.19042.1237
  • 10.0.19043.1237
  • 6.1.7601.25712
  • 6.3.9600.20120
  • 6.0.6003.21218
  • 6.2.9200.23462
  • 10.0.20348.230

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

Mitigation

Upgrade to a fixed release: 10.0.10240.19060, 10.0.14393.4651, 10.0.17763.2183, 10.0.18363.1801, 10.0.19041.1237, 10.0.19042.1237. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 2 hours ago·verify at source

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