CVE-2025-53809 — Improper Input Validation in Microsoft Windows 11 Version 24h2

CWE-20 — Improper Input Validation7 documents6 sources
Severity
6.5MEDIUMNVD
EPSS
0.3%
top 45.26%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Microsoft Windows 11 Version 24h2Microsoft Windows Server 2025Microsoft Windows 11 24h2
Timeline
PublishedSep 9

Description

Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages4 packages

▶NVDmicrosoft/windows< 10.0.26100.6508
▶NVDmicrosoft/windows_11_24h2< 10.0.26100.6508
▶CVEListV5microsoft/windows_server_202510.0.26100.0 — 10.0.26100.6584
▶CVEListV5microsoft/windows_11_version_24h210.0.26100.0 — 10.0.26100.6584

🔴Vulnerability Details

2
CVEList
Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability↗2025-09-09
▶
GHSA
GHSA-45gp-pfc8-39m2: Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network↗2025-09-09
▶

📋Vendor Advisories

1
Microsoft
Windows Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability↗2025-09-09
▶

🕵️Threat Intelligence

3
Bleepingcomputer
Microsoft September 2025 Patch Tuesday fixes 81 flaws, two zero-days↗2025-09-09
▶
Qualys
Microsoft and Adobe Patch Tuesday, September 2025 Security Update Review↗2025-09-09
▶
Qualys
Microsoft and Adobe Patch Tuesday, September 2025 Security Update Review | Qualys↗2025-09-09
▶
CVE-2025-53809 — Improper Input Validation in Microsoft | cvebase