Skip to content
CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-20831

Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
microsoft

Description

Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Microsoft Windows 10 Version 1607

  • 10.0.14393.0 to < 10.0.14393.8783affected

Microsoft Windows 10 Version 1809

  • 10.0.17763.0 to < 10.0.17763.8276affected

Microsoft Windows 10 Version 21H2

  • 10.0.19044.0 to < 10.0.19044.6809affected

Microsoft Windows 10 Version 22H2

  • 10.0.19045.0 to < 10.0.19045.6809affected

Microsoft Windows 11 version 23H2

  • 10.0.22631.0 to < 10.0.22631.6491affected

Microsoft Windows 11 Version 23H2

  • 10.0.22631.0 to < 10.0.22631.6491affected

Microsoft Windows 11 Version 24H2

  • 10.0.26100.0 to < 10.0.26100.7623affected

Microsoft Windows 11 Version 25H2

  • 10.0.26200.0 to < 10.0.26200.7623affected

Microsoft Windows Server 2008 R2 Service Pack 1

  • 6.1.7601.0 to < 6.1.7601.28117affected

Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation)

  • 6.1.7601.0 to < 6.1.7601.28117affected

Microsoft Windows Server 2008 Service Pack 2

  • 6.0.6003.0 to < 6.0.6003.23717affected

Microsoft Windows Server 2008 Service Pack 2 (Server Core installation)

  • 6.0.6003.0 to < 6.0.6003.23717affected

Microsoft Windows Server 2012

  • 6.2.9200.0 to < 6.2.9200.25868affected

Microsoft Windows Server 2012 (Server Core installation)

  • 6.2.9200.0 to < 6.2.9200.25868affected

Microsoft Windows Server 2012 R2

  • 6.3.9600.0 to < 6.3.9600.22968affected

Microsoft Windows Server 2012 R2 (Server Core installation)

  • 6.3.9600.0 to < 6.3.9600.22968affected

Microsoft Windows Server 2016

  • 10.0.14393.0 to < 10.0.14393.8783affected

Microsoft Windows Server 2016 (Server Core installation)

  • 10.0.14393.0 to < 10.0.14393.8783affected

Microsoft Windows Server 2019

  • 10.0.17763.0 to < 10.0.17763.8276affected

Microsoft Windows Server 2019 (Server Core installation)

  • 10.0.17763.0 to < 10.0.17763.8276affected

Microsoft Windows Server 2022

  • 10.0.20348.0 to < 10.0.20348.4648affected

Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)

  • 10.0.25398.0 to < 10.0.25398.2092affected

Microsoft Windows Server 2025

  • 10.0.26100.0 to < 10.0.26100.32230affected

Microsoft Windows Server 2025 (Server Core installation)

  • 10.0.26100.0 to < 10.0.26100.32230affected

References