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High7.1Microsoft Server

High [CVE-2021-38634] Microsoft Windows Update Client Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2021-38634 affecting Windows Server 2016 (Server Core installation), Windows Server 2019 (Server Core installation), Windows Server 2022.

CVE-2021-38634 Published Sep 15, 2021Updated by vendor Aug 10, 2026
CVE-2021-38634
Affected products & platforms
Microsoft ServerWindows Server
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Summary

Microsoft Windows Update Client Elevation of Privilege Vulnerability

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

Affected products named by the advisory: Windows Server 2022; Windows Server version 2004; Windows Server version 20H2.

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 Server 2016 10.0.14393.0 before 10.0.14393.4651
  • Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.4651
  • Windows Server 2019 10.0.17763.0 before 10.0.17763.2183
  • Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.2183

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
  • 10.0.20348.230

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

Mitigation checklist

Recommended fix / mitigation
  • Microsoft Windows Update Client Elevation of Privilege Vulnerability

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

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