Windows CVE-2026-20831
HIGHCVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Time-of-check time-of-use (toctou) race condition in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
AnalysisAI
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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RemediationAI
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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