CVE-2026-20831

HighCVSS 7.0/10Last modified Jul 30, 2026

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.

Metrics

CVSS 3.1 7.0/10CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-367

Affected software

No affected versions have been published.

Timeline

Published: Jan 13, 2026
Last modified: Jul 30, 2026
NVD status: Analyzed

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