Improper input validation in Microsoft Windows 11 24h2
CVE-2025-53809
Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.015 (73.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: +0.000
Affected products
- Microsoft Windows 11 24h2
- Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
- Microsoft Windows Server 2025 — versions 10.0.26100.0
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core Installation) — versions 10.0.26100.0
Weakness classification (CWE)
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53809 (vendor-advisory, patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-53809?
- CVE-2025-53809 is a medium-severity vulnerability in Microsoft Windows 11 24h2, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2025-09-09.
- How severe is CVE-2025-53809?
- Medium severity. CVSS v3 base score is 6.5 out of 10.