High severity · published Sep 15, 2021
CVE-2021-38644
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability
7.8
CVSS
2.3%
EPSS
No
On KEV
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.3% · higher than 83% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MV
Mpeg-2 Video Extension · Microsoft
before 1.0.42152.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38644
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-38644
msrc.microsoft.com
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38644
Patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38644
More from MPEG-2 Video Extension
8.8
CVE-2026-70343
Microsoft MPEG-2 Video Extension Remote Code Execution Vulnerability