CVE-2026-20854 — Use After Free in Microsoft Windows 11 Version 24h2

CWE-416 — Use After Free5 documents5 sources
Severity
7.5HIGHNVD
EPSS
0.1%
top 78.71%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
5
Microsoft Windows 11 Version 24h2Microsoft Windows 11 Version 25h2Microsoft Windows Server 2025+2 more
Timeline
PublishedJan 13

Description

Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network.

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.6 | Impact: 5.9

Affected Packages6 packages

▶NVDmicrosoft/windows< 10.0.26100.32230
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.7623
▶NVDmicrosoft/windows_11_25h2< 10.0.26200.7623
▶CVEListV5microsoft/windows_server_202510.0.26100.0 — 10.0.26100.32230
▶CVEListV5microsoft/windows_11_version_24h210.0.26100.0 — 10.0.26100.7623

🔴Vulnerability Details

2
GHSA
GHSA-7g73-j999-7mq6: Use after free in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to execute code over a network↗2026-01-13
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CVEList
Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability↗2026-01-13
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📋Vendor Advisories

1
Microsoft
Windows Local Security Authority Subsystem Service (LSASS) Remote Code Execution Vulnerability↗2026-01-13
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🕵️Threat Intelligence

1
Wiz
CVE-2026-20854 Impact, Exploitability, and Mitigation Steps | Wiz↗
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CVE-2026-20854 — Use After Free in Microsoft | cvebase