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CVE-2021-33740: Windows Media Remote Code Execution Vulnerability

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-14 · updated 2026-08-10

Description

Windows Media Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 1809, 2004
• Microsoft Windows Server 2016: 2004
• Microsoft Windows Server 2019: 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: from 10.0.17763.0 before 10.0.17763.2061 — fixed in 10.0.17763.2061
• Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1110 — fixed in 10.0.19041.1110
• Microsoft Windows Server 2019: from 10.0.17763.0 before 10.0.17763.2061 — fixed in 10.0.17763.2061
• Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1110 — fixed in 10.0.19041.1110

How to fix

Upgrade to a fixed version: Microsoft Windows 10 Version 1507 10.0.10240.19003; Microsoft Windows 10 10.0.17763.2061; Microsoft Windows 10 2004 10.0.19041.1110; Microsoft Windows Server 2019 10.0.17763.2061; Microsoft Windows Server version 2004 10.0.19041.1110. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33740
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33740

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