CVE-2025-21218

Name: CVE-2025-21218
Creator: NVD / NIST
Published: 2025-01-14T18:15:33.37+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.50%

Last modified Jun 17, 2026

CVE-2025-21218 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Windows Kerberos Denial of Service Vulnerability. EPSS estimates a 2.50% chance of exploitation in the next 30 days.

Description

Windows Kerberos Denial of Service Vulnerability

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.50%

82.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Microsoft	Windows Server 2012	All versions
Microsoft	Windows Server 2012	r2
Microsoft	Windows Server 2016	< 10.0.14393.7699
Microsoft	Windows Server 2019	< 10.0.17763.6775
Microsoft	Windows Server 2022	< 10.0.20348.3091
Microsoft	Windows Server 2022 23h2	< 10.0.25398.1369
Microsoft	Windows Server 2025	< 10.0.26100.2894

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21218Patch, Vendor Advisory

Timeline

Published: Jan 14, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-21218?

Windows Kerberos Denial of Service Vulnerability

How severe is CVE-2025-21218?

CVE-2025-21218 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.50% probability of exploitation in the next 30 days.

How do I fix CVE-2025-21218?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-21218?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST