What’s Vulnerable › Vulnerabilities

CVE-2021-34503: Microsoft Windows Media Foundation 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: 2021-07-14 · updated 2026-08-10

Description

Microsoft Windows Media Foundation Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 1809, 1909
• Microsoft Windows Server 2019: all versions
• Microsoft Windows 10: from 10.0.17763.0 before 10.0.17763.2061 — fixed in 10.0.17763.2061
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1679 — fixed in 10.0.18363.1679
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2061 — fixed in 10.0.17763.2061

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.2061; Microsoft Windows 10 1909 10.0.18363.1679; Microsoft Windows Server 2019 10.0.17763.2061. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34503
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34503

Get alerted when CVE-2021-34503 or the next vulnerability affects your stack