CVE-2026-80077 Remote Desktop Client Remote Code Execution Vulnerability

High 8.8 Published 8 Sep 2026 Updated 14 Oct 2026

Heap-based buffer overflow in Microsoft Remote Desktop Client allows unauthorized attackers to execute code over the network.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-80077?

CVE-2026-80077 is a high-severity memory corruption vulnerability in Microsoft Remote Desktop client for Windows Desktop, published on 8 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Weakness: CWE-122

Which versions are affected by CVE-2026-80077?

It affects 1 product.

Products include Microsoft Remote Desktop Client.

How do I fix CVE-2026-80077?

No fix has been published for CVE-2026-80077 yet. Limit exposure of the affected software until one is available.

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

Is CVE-2026-80077 being exploited?

There is no known exploitation of CVE-2026-80077 in the wild and no public exploit code.

Sources

Also known as GHSA-548x-6463-hm3w.