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TI-2021-08634 Aliases CVE-2021-27061GHSA-wr4h-h5w6-4xc7

HEVC Video Extensions Remote Code Execution Vulnerability

Priority MEDIUM 44Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.

Summary

HEVC Video Extensions Remote Code Execution Vulnerability

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.04624 91st percentileScored 2026-11-07
Fix Fixed HEVC Video Extensions (Microsoft): 1.0.40204.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftHEVC Video Extensions1.0.0 to before 1.0.40204.01.0.40204.0Patch availableCNA
  • HEVC Video Extensions VendorMicrosoft Affected 1.0.0 to before 1.0.40204.0 Fixed in 1.0.40204.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:high_efficiency_video_coding:-:*:*:*:*:*:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:a:microsoft:high_efficiency_video_coding:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

  • Fix · CNA HEVC Video Extensions (Microsoft) Fixed in 1.0.40204.0

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
HEVC Video ExtensionsFixed 1.0.40204.0 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27061
  2. 2026-10-03 Alias added: GHSA-wr4h-h5w6-4xc7

References

Patch 2

  • TI-2021-08509 HEVC Video Extensions Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2021-06385 HEVC Video Extensions Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2021-08623 HEVC Video Extensions Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2021-08635 HEVC Video Extensions Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2021-08624 HEVC Video Extensions Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
  • TI-2021-08622 HEVC Video Extensions Remote Code Execution Vulnerability CVSS 3.1HIGH 7.8
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences