CVE-2020-1350 Microsoft Windows DNS Server Remote Code Execution

Exploited in the wild Critical 10.0 Published 14 Jul 2020 Updated 21 Oct 2025

Remote attackers can execute arbitrary code on Windows DNS servers by sending specially crafted requests, requiring immediate patching.

Exploited in the wild: Since 3 Nov 2021
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-1350?

CVE-2020-1350 is a critical memory corruption vulnerability in Microsoft Windows Server 2008, published on 14 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A remote code execution vulnerability exists in Windows Domain Name System servers when they fail to properly handle requests, aka 'Windows DNS Server Remote Code Execution Vulnerability'.

Weakness: CWE-20

Which versions are affected by CVE-2020-1350?

It affects 4 products.

Products include Microsoft Windows Server 2008, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019.

How do I fix CVE-2020-1350?

No fix has been published for CVE-2020-1350 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-1350 being exploited?

Yes. Attackers have exploited CVE-2020-1350 in the wild since at least 3 Nov 2021.

Public exploit code: 15 proofs of concept on GitHub.

All Microsoft Windows Server 2008 vulnerabilities

Sources

Also known as GHSA-hcmx-443w-mr76.