CVE-2024-21342 Windows DNS Client Denial of Service Vulnerability

High 7.5 Published 13 Feb 2024 Updated 10 Aug 2026

An attacker can cause a denial of service in the Windows DNS Client, affecting Windows 11 and Server 2022 systems.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2024-21342?

CVE-2024-21342 is a high-severity denial of service vulnerability in Microsoft Windows 11 22h2, published on 13 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Windows DNS Client Denial of Service Vulnerability

Weakness: CWE-400

Which versions are affected by CVE-2024-21342?

It affects 3 products.

Products include Microsoft Windows 11 22h2, Microsoft Windows 11 23h2, Microsoft Windows Server 2022 23h2.

How do I fix CVE-2024-21342?

No fix has been published for CVE-2024-21342 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-21342 being exploited?

There is no known exploitation of CVE-2024-21342 in the wild and no public exploit code.

All Microsoft Windows 11 22h2 vulnerabilities

Sources

Also known as GHSA-95rw-m3jj-r8jm.