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CVE-2021-34439: Microsoft Windows Media Foundation Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-16 · updated 2026-08-10

Description

Microsoft Windows Media Foundation Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 1607
• Microsoft Windows Server 2016: all versions
• Microsoft Windows 10 Version 1507: from 10.0.10240.0 before 10.0.10240.19003 — fixed in 10.0.10240.19003
• Microsoft Windows 10 1607: from 10.0.14393.0 before 10.0.14393.4530 — fixed in 10.0.14393.4530
• Microsoft Windows Server 2016: from 10.0.14393.0 before 10.0.14393.4530 — fixed in 10.0.14393.4530

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19003; Microsoft Windows 10 1607 10.0.14393.4530; Microsoft Windows Server 2016 10.0.14393.4530. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34439
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34439

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