CVE-2021-43209 3D Viewer Remote Code Execution Vulnerability

High 7.8 Published 10 Nov 2021 Updated 19 Aug 2026

Attackers can execute arbitrary code via the Microsoft 3D Viewer application, requiring users to apply vendor patches.

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-2021-43209?

CVE-2021-43209 is a high-severity code injection vulnerability in Microsoft 3D Viewer, published on 10 Nov 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

3D Viewer Remote Code Execution Vulnerability

Which versions are affected by CVE-2021-43209?

It affects 1 product.

Products include Microsoft 3d Viewer.

How do I fix CVE-2021-43209?

No fix has been published for CVE-2021-43209 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-2021-43209 being exploited?

There is no known exploitation of CVE-2021-43209 in the wild and no public exploit code.

Sources

Also known as GHSA-f332-w5ff-84px.