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7.8

Windows Media Foundation Remote Code Execution in Windows

CVE-2021-42276 · published 4 years ago
Summary

A vulnerability in Windows Media Foundation could allow hackers to run malicious code on a Windows computer without permission. This could lead to data theft, system crashes, or other security issues. To protect your system, make sure to install the latest Windows updates and follow recommended security best practices.

What to do
  • Update microsoft windows 10 version 1507 to version 10.0.10240.19119 or later.
  • Update microsoft windows 10 version 1607 to version 10.0.14393.4770 or later.
  • Update microsoft windows 10 version 1809 to version 10.0.17763.2300 or later.
  • Update microsoft windows 10 version 1909 to version 10.0.18363.1916 or later.
  • Update microsoft windows 10 version 2004 to version 10.0.19041.1348 or later.
  • Update microsoft windows 10 version 20h2 to version 10.0.19042.1348 or later.
  • Update microsoft windows 10 version 21h1 to version 10.0.19043.1348 or later.
  • Update microsoft windows 11 version 21h2 to version 10.0.22000.318 or later.
  • Update microsoft windows server 2016 to version 10.0.14393.4770 or later.
  • Update microsoft windows server 2016 (server core installation) to version 10.0.14393.4770 or later.
  • Update microsoft windows server 2019 to version 10.0.17763.2300 or later.
  • Update microsoft windows server 2019 (server core installation) to version 10.0.17763.2300 or later.
  • Update microsoft windows server 2022 to version 10.0.20348.350 or later.
  • Update microsoft windows server version 2004 to version 10.0.19041.1348 or later.
  • Update microsoft windows server version 20h2 to version 10.0.19041.1348 or later.
Affected software
VendorProductAffected versions
microsoft windows 10 version 1507 < 10.0.10240.19119
microsoft windows 10 version 1607 < 10.0.14393.4770
microsoft windows 10 version 1809 < 10.0.17763.2300
microsoft windows 10 version 1909 < 10.0.18363.1916
microsoft windows 10 version 2004 < 10.0.19041.1348
microsoft windows 10 version 20h2 < 10.0.19042.1348
microsoft windows 10 version 21h1 < 10.0.19043.1348
microsoft windows 11 version 21h2 < 10.0.22000.318
microsoft windows server 2016 < 10.0.14393.4770
microsoft windows server 2016 (server core installation) < 10.0.14393.4770
microsoft windows server 2019 < 10.0.17763.2300
microsoft windows server 2019 (server core installation) < 10.0.17763.2300
microsoft windows server 2022 < 10.0.20348.350
microsoft windows server version 2004 < 10.0.19041.1348
microsoft windows server version 20h2 < 10.0.19041.1348
microsoft windows_10 20h2
21h1
1607
1809
1909
2004
cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:*
microsoft windows_11 All versions
cpe:2.3:o:microsoft:windows_11:-:*:*:*:*:*:arm64:*
microsoft windows_server_2016 20h2
2004
cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*
microsoft windows_server_2019 All versions
cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*
microsoft windows_server_2022 All versions
cpe:2.3:o:microsoft:windows_server_2022:-:*:*:*:*:*:*:*
Original advisory text
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
Microsoft Windows Media Foundation Remote Code Execution Vulnerability
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
7.8 High
Exploitation
2% chance of attack within 30 days
Timeline
Published10 Nov 2021
Updated29 Oct 2026
First seen19 Aug 2026
Sources
CVE-2021-42276 · NVD
CVE-2021-42276 · MITRE
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