CVE-2021-40453: HEVC Video Extensions Remote Code Execution Vulnerability

Overview

Severity
High (CVSS 7.8)
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Category
Remote Code Execution
Exploit Status
Not Exploited
Exploitation Likelihood
Less Likely
Patch Tuesday
2021-Dec
Released
2021-12-14
Last Updated
2022-01-06
EPSS Score
4.64% (percentile: 89.3%)

FAQ

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? If your device manufacturer preinstalled this app, package versions 1.0.42701.0 and later contain this update. If you purchased this app from the Microsoft Store, package versions 1.0.42701.0 and later contain this update. You can check the package version in PowerShell: Get-AppxPackage -Name Microsoft.HEVCVideoExtension*

Affected Products (1)

Windows

  • HEVC Video Extensions

Acknowledgments

<a href="https://twitter.com/4zure9">Azure Yang</a> with <a href="http://www.cyberkl.com/">Cyber Kunlun Lab</a>

Revision History

  • 2021-12-14: Information published.
  • 2022-01-06: Added an FAQ. This is an information change only.