— Unscored

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

CVE-2026-68820 Exploited

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.

Being exploited in the wild

Catalogued 11 August 2026 · US federal remediation deadline 25 August 2026

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…

Exploit code is also public: Public PoC

Public PoCubitquity/Windows-WinSock-UAF-Mitigation1 stars
Public PoCfevar54/CVE-2026-68820-Mitigation-PoC-1 stars
Public PoCHORKimhab/CVE-2026-68820
Public PoCmaxprog-svg/CVE-2026-68820_Mass_Exploit

Assessment

CVSS: Not yet scored
Severity: Unscored
Known exploited: Yes — listed in the CISA KEV catalog
Exploit availability: CISA KEV, Public PoC
Published: 11 August 2026
Last updated: 11 August 2026
Affected: Microsoft · Windows Ancillary Function Driver for WinSock
Weakness: CWE-416

At the source

CISA KEV

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog

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