CVE-2020-1466 Windows Remote Desktop Gateway (RD Gateway) Denial of Service Vulnerability

High 7.8 Published 17 Aug 2020 Updated 1 Oct 2024

An attacker can cause the Windows Remote Desktop Gateway service to stop responding by sending specially crafted RDP requests.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-1466?

CVE-2020-1466 is a high-severity denial of service vulnerability in Microsoft Windows Server 2012, published on 17 Aug 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A denial of service vulnerability exists in Windows Remote Desktop Gateway (RD Gateway) when an attacker connects to the target system using RDP and sends specially crafted requests. An attacker who successfully exploited this vulnerability could cause the RD Gateway service on the target system to stop responding. To exploit this vulnerability, an attacker would need to run a specially crafted application against a server which provides RD Gateway services. The update addresses the vulnerability by correcting how RD Gateway handles connection requests.

Which versions are affected by CVE-2020-1466?

It affects 3 products.

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

How do I fix CVE-2020-1466?

No fix has been published for CVE-2020-1466 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-2020-1466 being exploited?

There is no known exploitation of CVE-2020-1466 in the wild and no public exploit code.

All Microsoft Windows Server 2012 vulnerabilities

Sources

Also known as GHSA-9fj9-5r8v-mh44.