CVE-2024-21342

Name: CVE-2024-21342
Creator: NVD / NIST
Published: 2024-02-13T18:15:49.803+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.56%

Last modified Jun 17, 2026

CVE-2024-21342 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Windows DNS Client Denial of Service Vulnerability. EPSS estimates a 2.56% chance of exploitation in the next 30 days.

Description

Windows DNS Client 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

2.56%

83.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Microsoft	Windows 11 22h2	< 10.0.22621.3155
Microsoft	Windows 11 23h2	< 10.0.22621.3155
Microsoft	Windows Server 2022 23h2	< 10.0.25398.709

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21342Patch, Vendor Advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-21342Patch, Vendor Advisory

Timeline

Published: Feb 13, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-21342?

Windows DNS Client Denial of Service Vulnerability

How severe is CVE-2024-21342?

CVE-2024-21342 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.56% probability of exploitation in the next 30 days.

How do I fix CVE-2024-21342?

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-2024-21342?

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

Scan your code now

Source: NVD / NIST