CVE-2026-20860

HighCVSS 7.8

Published: 13/01/2026(UTC)Updated: 30/07/2026(UTC)Translated: 31/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Very high risk

7.98%

94th percentile - higher than 94% of all known CVEs

Summary

A type confusion vulnerability in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Risk Assessment

An authorized attacker can elevate their privileges on the system, potentially leading to full system control.

Recommendation

Install the latest Windows security updates from Microsoft.

Other vulnerabilities in Windows Ancillary Function Driver for WinSock

See all

CVE-2026-34344High
The Windows Ancillary Function Driver for WinSock has a vulnerability related to resource access using an incompatible type ('type confusion'), allowing an authorized attacker to elevate privileges locally.
CVE-2026-20810High
A vulnerability in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally. The issue involves freeing memory not on the heap.
CVE-2026-68820HighActively exploited
Use-after-free in Windows Ancillary Function Driver for WinSock. An authorized attacker can elevate privileges locally.
CVE-2026-70342High
Use after free in Windows Ancillary Function Driver for WinSock allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-50349High
A race condition in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-70307High
A use-after-free vulnerability in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-61348High
A use-after-free vulnerability in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-57093High
A use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVE-2026-50462High
The Windows Ancillary Function Driver for WinSock has an external control of file name or path vulnerability, allowing an authorized attacker to elevate privileges locally.
CVE-2026-50312Medium
Use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock. Allows an authorized attacker to elevate privileges locally.

Original NVD description (English source)

Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.