CVE-2021-27051 HEVC Video Extensions Remote Code Execution Vulnerability

High 7.8 Published 11 Mar 2021 Updated 19 Aug 2026

An attacker can execute arbitrary code via the HEVC Video Extensions component in Microsoft Windows.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-27051?

CVE-2021-27051 is a high-severity code injection vulnerability in Microsoft HEVC Video Extensions, published on 11 Mar 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

HEVC Video Extensions Remote Code Execution Vulnerability

Which versions are affected by CVE-2021-27051?

It affects 1 product.

Products include Microsoft High Efficiency Video Coding.

How do I fix CVE-2021-27051?

No fix has been published for CVE-2021-27051 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2021-27051 being exploited?

There is no known exploitation of CVE-2021-27051 in the wild and no public exploit code.

Sources

Also known as GHSA-7pcj-84hj-g762.