CVE-2026-68820Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
- Product
- Microsoft Windows Ancillary Function Driver for WinSock
- Added to CISA KEV
- August 11, 2026
- Deadline for US federal agencies
- August 25, 2026
- Known ransomware use
- Not known
- EPSS, next 30 days
- 0.3%, higher than 26% of scored CVEs (Oct 25, 2026)
- Weakness
- CWE-416
What CISA says
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.
What CISA asks you to do
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.
Sources
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Data from CISA's Known Exploited Vulnerabilities catalog (public domain) and FIRST EPSS, refreshed hourly. Rheono did not find or test this vulnerability; this page summarizes public sources.