CVE-2021-38644: Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability

Is Windows vulnerable in the default configuration?

No. Only customers who have installed this app from the Microsoft Store may be vulnerable.

How do I get the updated app?

The Microsoft Store will automatically update affected customers. Alternatively, customers can get the update immediately; see here for details.

It is possible for customers to disable automatic updates for the Microsoft Store. The Microsoft Store will not automatically install this update for those customers.

My system is in a disconnected environment; is it vulnerable?

Customers using the Microsoft Store for Business and Microsoft Store for Education can get this update through their organizations.

How can I check if the update is installed?

App package versions 1.0.42152.0 and later contain this update.

You can check the package version in PowerShell:

Get-AppxPackage -Name Microsoft.MPEG2VideoExtension