[ CVE-2025-32709 · Published 13 May 2025 ]
Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability
Exploited · CISA KEV CVSS 7.8
EPSS 2%No fix listed yet
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-05-13
[ Description ]Official description
Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CISA: Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 3 Jun 2025): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-32709Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource