[ CVE-2025-21418 · Published 11 Feb 2025 ]
Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability
Exploited · CISA KEV CVSS 7.8
EPSS 2%Fix available
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2025-02-11
[ Description ]Official description
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CISA: Microsoft Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 4 Mar 2025): Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- Patch on msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418PatchVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource