CVE-2026-20810 HIGH

CVE-2026-20810: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability

Vendor Microsoft
Product Windows 10 Version 1809
Weakness CWE-590
Published January 13, 2026
Last update April 1, 2026
View on NVD All CVEs

CVSS base score

7.8/10
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

What the vulnerability does

01Description

Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Key dates

02Disclosure timeline

January 13, 2026 CVE published
April 1, 2026 Record updated