High7.5Microsoft Server

High [CVE-2021-33785] Windows AF_UNIX Socket Provider Denial of Service Vulnerability

This high-severity Microsoft Server advisory covers CVE-2021-33785 affecting Windows Server 2019 (Server Core installation), Windows Server version 2004, Windows Server version 20H2.

CVE-2021-33785 Published Jul 14, 2021Updated by vendor Aug 10, 2026

CVE-2021-33785

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Windows AF_UNIX Socket Provider Denial of Service Vulnerability

Affected products named by the advisory: Windows Server 2019; Windows Server 2019 (Server Core installation); Windows Server version 2004; Windows Server version 20H2.

Affected versions

Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.2061
Windows 10 Version 1809 10.0.0 before 10.0.17763.2061
Windows 10 Version 1909 10.0.0 before 10.0.18363.1679
Windows 10 Version 2004 10.0.0 before 10.0.19041.1110
Windows 10 Version 20H2 10.0.0 before 10.0.19042.1110
Windows 10 Version 21H1 10.0.0 before 10.0.19043.1110
Windows Server 2019 10.0.17763.0 before 10.0.17763.2061
Windows Server 2019 (Server Core installation) 10.0.17763.0 before 10.0.17763.2061
Windows Server version 2004 10.0.0 before 10.0.19041.1110
Windows Server version 20H2 10.0.0 before 10.0.19042.1110

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

Fixed versions

10.0.17763.2061
10.0.18363.1679
10.0.19041.1110
10.0.19042.1110
10.0.19043.1110

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

Mitigation

Upgrade to a fixed release: 10.0.17763.2061, 10.0.18363.1679, 10.0.19041.1110, 10.0.19042.1110, 10.0.19043.1110. 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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