CVE-2021-28465: Web Media 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-May
Released
2021-05-11
EPSS Score
14.22% (percentile: 94.4%)

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? App package versions 1.0.40831.0 and later contain this update. You can check the package version in PowerShell: Get-AppxPackage -Name Microsoft.WebMediaExtensions

Affected Products (1)

Windows

  • Web Media Extensions

Acknowledgments

Wayne Low of Fortinet’s FortiGuard Lab, garmin working with <a href="https://www.zerodayinitiative.com/">Trend Micro Zero Day Initiative</a>

Revision History

  • 2021-05-11: Information published.