CVE-2025-53809 — MEDIUM (6.5)

Q: What is CVE-2025-53809?

CVE-2025-53809 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.

Q: How severe is CVE-2025-53809?

CVE-2025-53809 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2025-53809?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows Server 2025.

Vulnerability Description

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

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Microsoft	Windows 11 24H2	< 10.0.26100.6508
Microsoft	Windows Server 2025	< 10.0.26100.6508

Related Weaknesses (CWE)

CWE-20

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53809Vendor Advisory

FAQ

What is CVE-2025-53809?

CVE-2025-53809 is a vulnerability with a CVSS score of 6.5 (MEDIUM). Improper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.

How severe is CVE-2025-53809?

CVE-2025-53809 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-53809?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows Server 2025.