CVE-2021-38661: HEVC Video Extensions Remote Code Execution Vulnerability

Severity: medium (CVSS 6.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-09-15 · updated 2026-08-10

Description

HEVC Video Extensions Remote Code Execution Vulnerability

Affected products

Microsoft HEVC Video Extensions: before 1.0.42094.0 — fixed in 1.0.42094.0
Microsoft HEVC Video Extensions: from 1.0.0 before 1.0.42094.0 — fixed in 1.0.42094.0

How to fix

Upgrade to a fixed version: Microsoft HEVC Video Extensions 1.0.42094.0; Microsoft HEVC Video Extensions 1.0.42094.0. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38661
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-38661

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