What’s Vulnerable › Vulnerabilities

CVE-2021-33777: HEVC Video Extensions Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-14 · updated 2026-08-10

Description

HEVC Video Extensions Remote Code Execution Vulnerability

Affected products

• Microsoft HEVC Video Extensions: before 1.0.41531.0 — fixed in 1.0.41531.0
• Microsoft HEVC Video Extensions: from 1.0.0 before 1.0.41531.0 — fixed in 1.0.41531.0

How to fix

Upgrade to a fixed version: Microsoft HEVC Video Extensions 1.0.41531.0; Microsoft HEVC Video Extensions 1.0.41531.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33777
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33777

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