CVE-2026-20810
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
| Vendor | microsoft |
| Product | windows 10 version 1809 |
| Ecosystems | |
| Industries | TechnologyEnterprise |
| Published | Jan 13, 2026 |
| Last Updated | Apr 1, 2026 |
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CVSS v3 Breakdown
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 Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Microsoft / Windows 10 Version 1809
10.0.17763.0 < 10.0.17763.8276
Microsoft / Windows 10 Version 21H2
10.0.19044.0 < 10.0.19044.6809
Microsoft / Windows 10 Version 22H2
10.0.19045.0 < 10.0.19045.6809
Microsoft / Windows Server 2019
10.0.17763.0 < 10.0.17763.8276
Microsoft / Windows Server 2019 (Server Core installation)
10.0.17763.0 < 10.0.17763.8276