Actively exploited · Published Feb 11, 2025 · Assigned by microsoft
CVE-2025-21418Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
High 7.8 Exploited
In plain English
A high-severity heap buffer overflow in Windows 10 Version 1507 from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on February 11, 2025). The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% of all known vulnerabilities). Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CISA guidance
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Federal agencies must remediate by Mar 4, 2025.
Official description
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Affected products (as reported)
Weakness: CWE-122 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
References
- Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability vendor-advisory, patch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-21418 government-resource