CVE-2021-40166 Use after free in Revit, Inventor, Infraworks, Navisworks, Fusion, Infrastructure Parts Editors, Autodesk Advanced Steel, Civil 3D, AutoCAD, AutoCAD LT, AutoCAD Architecture, AutoCAD Electrical, AutoCAD Map 3D, AutoCAD Mechanical, AutoCAD MEP, AutoCAD Plant 3D

High 7.8 Published 7 Oct 2022 Updated 4 Aug 2024

Attackers can execute arbitrary code by tricking users into opening a maliciously crafted PNG file in Autodesk CAD applications.

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-2021-40166?

CVE-2021-40166 is a high-severity use after free vulnerability in Autodesk Autocad, published on 7 Oct 2022. 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

A maliciously crafted PNG file in Autodesk Image Processing component may be used to attempt to free an object that has already been freed while parsing them. This vulnerability may be exploited by attackers to execute arbitrary code.

Weakness: CWE-416

Which versions are affected by CVE-2021-40166?

It affects 19 products.

Products include Autodesk Autocad, Autodesk Autocad Advance Steel, Autodesk Autocad Architecture, Autodesk Autocad Civil 3d, Autodesk Autocad Electrical, Autodesk Autocad Lt and 13 more.

How do I fix CVE-2021-40166?

No fix has been published for CVE-2021-40166 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2021-40166 being exploited?

There is no known exploitation of CVE-2021-40166 in the wild and no public exploit code.

All Autodesk Autocad vulnerabilities

Sources

Also known as GHSA-mfx9-gcm4-c79c.