Feb 2026: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVE-2026-21241 Published on February 10, 2026
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-21241 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-21241
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Affected Versions
Microsoft Windows 11 version 22H3:- Version 10.0.22631.0 and below 10.0.22631.6649 is affected.
- Version 10.0.22631.0 and below 10.0.22631.6649 is affected.
- Version 10.0.26100.0 and below 10.0.26100.7840 is affected.
- Version 10.0.26200.0 and below 10.0.26200.7840 is affected.
- Version 10.0.28000.0 and below 10.0.28000.1575 is affected.
- Version 10.0.28000.0 and below 10.0.28000.1575 is affected.
- Version 10.0.20348.0 and below 10.0.20348.4773 is affected.
- Version 10.0.25398.0 and below 10.0.25398.2149 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32370 is affected.
- Version 10.0.26100.0 and below 10.0.26100.32370 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.