Elevation of Privilege in Windows Ancillary Function Driver for WinSock
CVE-2026-25178

7HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1607
Windows 10 Version 1809
Windows 10 Version 21h2
Windows 10 Version 22h2
Vendor
CVE Published:
10 March 2026

What is CVE-2026-25178?

A use after free vulnerability exists in the Windows Ancillary Function Driver for WinSock that can be exploited by an authorized attacker to elevate their privileges locally. This weakness could potentially allow the attacker to execute arbitrary commands with elevated permissions, compromising the system's integrity and security. Awareness and timely patching are crucial to mitigate this vulnerability effectively.

Affected Version(s)

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8957

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.8511

Windows 10 Version 21H2 32-bit Systems 10.0.19044.0 < 10.0.19044.7058

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.