CVE-2026-20842 — Use After Free in Microsoft Windows 10 Version 21h2

CWE-416 — Use After Free5 documents5 sources
Severity
7.0HIGHNVD
EPSS
0.0%
top 90.96%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
14
Microsoft Windows 10 Version 21h2Microsoft Windows 10 Version 22h2Microsoft Windows 11 Version 22h3+11 more
Timeline
PublishedJan 13

Description

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

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.0 | Impact: 5.9

Affected Packages14 packages

▶NVDmicrosoft/windows< 10.0.20348.4648+2
▶NVDmicrosoft/windows_10_21h2< 10.0.19044.6809
▶NVDmicrosoft/windows_10_22h2< 10.0.19045.6809
▶NVDmicrosoft/windows_11_23h2< 10.0.22631.6491
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.7623

🔴Vulnerability Details

2
CVEList
Microsoft DWM Core Library Elevation of Privilege Vulnerability↗2026-01-13
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GHSA
GHSA-4f9p-rpf6-78qv: Use after free in Windows DWM allows an authorized attacker to elevate privileges locally↗2026-01-13
▶

📋Vendor Advisories

1
Microsoft
Microsoft DWM Core Library Elevation of Privilege Vulnerability↗2026-01-13
▶

🕵️Threat Intelligence

1
Wiz
CVE-2026-20842 Impact, Exploitability, and Mitigation Steps | Wiz↗
▶
CVE-2026-20842 — Use After Free in Microsoft | cvebase