High7.8Microsoft Server

High [CVE-2026-33837] Windows TCP/IP Local Elevation of Privilege Vulnerability

This high-severity Microsoft Server advisory covers CVE-2026-33837 affecting Windows Server 2012 (Server Core installation), Windows Server 2012 R2 (Server Core installation), Windows Server 2016 (Server Core installation).

CVE-2026-33837 Published May 12, 2026Updated by vendor Aug 10, 2026

CVE-2026-33837

Affected products & platforms

Microsoft ServerWindows Server

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Summary

Heap-based buffer overflow in Windows TCP/IP allows an authorized attacker to elevate privileges locally.

Affected products named by the advisory: Windows Server 2012; Windows Server 2012 (Server Core installation); Windows Server 2012 R2; Windows Server 2012 R2 (Server Core installation); and 8 more.

Affected products named by the advisory: Windows Server 2016 (Server Core installation); Windows Server 2019 (Server Core installation); Windows Server 2022, 23H2 Edition (Server Core installation); Windows Server 2025 (Server Core installation).

Affected versions

Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9140
Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.8755
Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7291
Windows 10 Version 22H2 10.0.19045.0 before 10.0.19045.7417
Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7079
Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7219
Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.8457
Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.8457
Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.2113
Windows Server 2012 6.2.9200.0 before 6.2.9200.26079
Windows Server 2012 (Server Core installation) 6.2.9200.0 before 6.2.9200.26079
Windows Server 2012 R2 6.3.9600.0 before 6.3.9600.23181

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

Fixed versions

10.0.14393.9140
10.0.17763.8755
10.0.19044.7291
10.0.19045.7417
10.0.22631.7079
10.0.22631.7219
10.0.26100.8457
10.0.26200.8457
10.0.28000.2113
6.2.9200.26079
6.3.9600.23181
10.0.20348.5139

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

Mitigation

Upgrade to a fixed release: 10.0.14393.9140, 10.0.17763.8755, 10.0.19044.7291, 10.0.19045.7417, 10.0.22631.7079, 10.0.22631.7219. 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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