CVE-2026-21241: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Microsoft · Windows 11 version 22H3
Vendor fix available · Affected: Microsoft Windows 11 version 22H3 · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 85% of scored CVEs
DescriptionCVE.org
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected products10
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Microsoft · Windows 11 version 22H3from 10.0.22631.0 before 10.0.22631.6649
- Microsoft · Windows 11 Version 23H2from 10.0.22631.0 before 10.0.22631.6649
- Microsoft · Windows 11 Version 24H2from 10.0.26100.0 before 10.0.26100.7840
- Microsoft · Windows 11 Version 25H2from 10.0.26200.0 before 10.0.26200.7840
- Microsoft · Windows 11 version 26H1from 10.0.28000.0 before 10.0.28000.1575
- Microsoft · Windows 11 Version 26H1from 10.0.28000.0 before 10.0.28000.1575
- Microsoft · Windows Server 2022from 10.0.20348.0 before 10.0.20348.4773
- Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)from 10.0.25398.0 before 10.0.25398.2149
- Microsoft · Windows Server 2025from 10.0.26100.0 before 10.0.26100.32370
- Microsoft · Windows Server 2025 (Server Core installation)from 10.0.26100.0 before 10.0.26100.32370
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Microsoft
- Published
- February 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-21241 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.