CVE-2026-33099
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Published Apr 14, 2026 · updated Oct 14, 2026 · Microsoft Windows 10 Version 1607
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Timeline
Detection, updates, and resolution for this record.
Apr 14, 2026 · NIST NVD
Detected
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Oct 14, 2026 · NIST NVD
Updated
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected
- cpe microsoft/windows 10 1607version unspecified
- cpe microsoft/windows 10 1809version unspecified
- cpe microsoft/windows 10 21h2version unspecified
- cpe microsoft/windows 10 22h2version unspecified
- vendor Microsoft Windows 10 Version 1607version unspecified
- vendor Microsoft Windows 10 Version 1809version unspecified
- vendor Microsoft Windows 10 Version 21H2version unspecified
- vendor Microsoft Windows 10 Version 22H2version unspecified
- vendor Microsoft Windows 11 Version 23H2version unspecified
- vendor Microsoft Windows 11 Version 24H2version unspecified
- vendor Microsoft Windows 11 Version 25H2version unspecified
- vendor Microsoft Windows 11 version 23H2version unspecified
Sources
- CIRCL Vulnerability LookupCVE-2026-33099
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
vulnerability.circl.lu - CVE.orgCVE-2026-33099
Official CVE identifier
cve.org - FIRST EPSSCVE-2026-33099
30-day exploitation probability 0.3%
first.org - NIST NVDCVE-2026-33099
Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
nvd.nist.gov