CVE-2026-20831

HIGH
2026-01-13 [email protected]
7.8
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 13, 2026 - 18:16 nvd
HIGH 7.8

Tags

Windows Race Condition Windows Server 2008 Windows Server 2019 Windows 10 22h2 Windows 11 25h2 Windows Server 2025 Windows 10 1607 Windows Server 2022 23h2 Windows Server 2012 Windows 10 1809 Windows 11 23h2 Windows 11 24h2 Windows 10 21h2 Windows Server 2016 Windows Server 2022 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.

Analysis

Windows Ancillary Function Driver for WinSock contains a race condition that enables local privilege escalation on affected Windows systems including Server 2008, Server 2019, and Windows 10 22H2. An authenticated attacker can exploit this timing vulnerability to gain elevated privileges with high impact to confidentiality, integrity, and availability. …

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Remediation

Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.

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Priority Score

39
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +39
POC: 0

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CVE-2026-20831 vulnerability details – vuln.today
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