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CVE-2026-68820

Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

Microsoft Windows Ancillary Function Driver for WinSock CWE-416

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS Score
7
High
EPSS — Exploit Probability
0.3%
Riskier than 24% of all CVEs · checked 2026-09-25
Exploitation
Confirmed in the wild
KEV since 2026-08-11
Remediation
Patch available
Federal deadline 2026-08-25
CISA required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. Deadline for federal agencies: 2026-08-25.

NVD entry Vendor patch PoC / advisory CISA KEV

18 articles across 11 outlets · first covered Aug 11, 2026 · latest Aug 17, 2026

Associated threat actors

Coverage timeline

Related CVEs — Microsoft