Actively exploited in the wild
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
Microsoft - Windows Ancillary Function Driver for WinSock · Listed in the CISA KEV since 2026-08-11. This indicates confirmed attacks in production environments.
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.
CVE-2026-68820
HighCVSS 7.0KEVSummary
Use-after-free in Windows Ancillary Function Driver for WinSock. An authorized attacker can elevate privileges locally.
Risk Assessment
Privilege escalation could allow an attacker to gain full control of the system, posing a serious security threat.
Recommendation
Install the latest Windows updates and monitor the system for unusual activity.
Original NVD description (English source)
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.