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Medium severity6.5NVD Advisory· Published Sep 9, 2025· Updated Jun 17, 2026

CVE-2025-53809

CVE-2025-53809

Description

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

Affected products

4

Microsoft/Local Security Authority Subsystem Servicellm-fuzzy
Microsoft/Windows 11 24h2cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows Server 2025cpe-rescue
Range: 10.0.26100.0
Microsoft/Windows Server 2025 (Server Core installation)v5
Range: 10.0.26100.0

Patches

Vulnerability mechanics

References

1

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53809nvdVendor Advisory

News mentions

0

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