CVE-2026-20842

HIGH

Windows 10 21H2/22H2, Windows 11 23H2/24H2/25H2, Windows Server 2022/2022 23H2/2025 - Use-After-Free in DWM

Title source: llm
STIX 2.1

Description

Use after free in Windows DWM allows an authorized attacker to elevate privileges locally.

References (1)

Core 1
Core References

Scores

CVSS v3 7.0
EPSS 0.0005
EPSS Percentile 14.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (18)
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 11 version 22H3 10.0.22631.0 - 10.0.22631.6491
Microsoft/Windows 11 Version 23H2 10.0.22631.0 - 10.0.22631.6491
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.7623
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.7623
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.4648
Microsoft/Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 - 10.0.25398.2092
Microsoft/Windows Server 2025 10.0.26100.0 - 10.0.26100.32230
Microsoft/Windows Server 2025 (Server Core installation) 10.0.26100.0 - 10.0.26100.32230
... and 8 more
Published Jan 13, 2026
Tracked Since Feb 18, 2026