Medium5.5Microsoft Server

Medium [CVE-2021-36961] Windows Installer Denial of Service Vulnerability

This medium-severity Microsoft Server advisory covers CVE-2021-36961 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-2021-36961 Published Sep 15, 2021Updated by vendor Aug 10, 2026

CVE-2021-36961

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Windows Installer Denial of Service 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

Discussion(0)

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