CVE-2025-21311 — CRITICAL (9.8)

Q: What is CVE-2025-21311?

CVE-2025-21311 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Windows NTLM V1 Elevation of Privilege Vulnerability

Q: How severe is CVE-2025-21311?

CVE-2025-21311 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Q: Is there a patch for CVE-2025-21311?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows Server 2022 23H2, Microsoft Windows Server 2025.

Vulnerability Description

Windows NTLM V1 Elevation of Privilege Vulnerability

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Microsoft	Windows 11 24H2	< 10.0.26100.2894
Microsoft	Windows Server 2022 23H2	< 10.0.25398.1369
Microsoft	Windows Server 2025	< 10.0.26100.2894

Related Weaknesses (CWE)

CWE-303

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21311PatchVendor Advisory

FAQ

What is CVE-2025-21311?

CVE-2025-21311 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Windows NTLM V1 Elevation of Privilege Vulnerability

How severe is CVE-2025-21311?

CVE-2025-21311 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2025-21311?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 24H2, Microsoft Windows Server 2022 23H2, Microsoft Windows Server 2025.