Windows Kerberos Denial of Service Vulnerability in Microsoft Products
CVE-2025-21218

7.5HIGH

Key Information:

Vendor
Microsoft
Status
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Windows Server 2025 (server Core Installation)
Vendor
CVE Published:
14 January 2025

Summary

A significant vulnerability has been identified in the Windows Kerberos authentication system, which could lead to a Denial of Service. This flaw may allow an attacker to disrupt the normal operations of the Kerberos protocol, causing affected systems to become unresponsive. Organizations using Microsoft products, particularly those running specific versions of Windows Server and Windows, should take immediate action to assess their security posture and implement recommended patches to mitigate potential risks.

Affected Version(s)

Windows Server 2012 (Server Core installation) x64-based Systems 6.2.9200.0 < 6.2.9200.25273

Windows Server 2012 R2 (Server Core installation) x64-based Systems 6.3.9600.0 < 6.3.9600.22371

Windows Server 2012 R2 x64-based Systems 6.3.9600.0 < 6.3.9600.22371

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.