CVE-2025-21418
Microsoft Windows 10 Version 1507, Microsoft Windows 10 Version 1607, Microsoft Windows 10 Version 1809
Published 11 Feb 2025 · updated 17 Jun 2026 · Analyzed
7.8 High · CVSS 3.1, microsoft.com
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 11 Feb 2025, with a remediation deadline of 4 Mar 2025 for US federal agencies.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21418 · Patch, Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21418 · US Government Resource