August 11, 2026 · Applied Cybernetics Group
CVE-2026-68820 — Microsoft Windows Ancillary Function Driver for WinSock
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
- Added to KEV
2026-08-11- Federal due date
2026-08-25- Vendor
- Microsoft
- Product
- Windows Ancillary Function Driver for WinSock
- EPSS
- 93.1th percentile (score 0.062, as of
2026-09-16) - NVD CVSS v3.1
- 7 (HIGH)
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2026-68820
CISA short description
Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to elevate privileges locally.
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.
NVD description
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.