CVE-2021-41330: 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: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-10-13 · updated 2026-06-17

Description

Microsoft Windows Media Foundation Remote Code Execution Vulnerability

Affected products

Microsoft Windows 10 Version 1607: 20h2, 21h1, 1809, 1909, 2004
Microsoft Windows Server 2016: 20h2, 2004
Microsoft Windows Server 2019: all versions
Microsoft Windows 10: from 10.0.0 before 10.0.17763.2237 — fixed in 10.0.17763.2237
Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1854 — fixed in 10.0.18363.1854
Microsoft Windows 10 2004: from 10.0.0 before 10.0.19041.1288 — fixed in 10.0.19041.1288
Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1288 — fixed in 10.0.19042.1288
Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1288 — fixed in 10.0.19043.1288
Microsoft Windows Server 2019: from 10.0.0 before 10.0.17763.2237 — fixed in 10.0.17763.2237
Microsoft Windows Server version 2004: from 10.0.0 before 10.0.19041.1288 — fixed in 10.0.19041.1288
Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1288 — fixed in 10.0.19042.1288

How to fix

Upgrade to a fixed version: Microsoft Windows 10 10.0.17763.2237; Microsoft Windows 10 1909 10.0.18363.1854; Microsoft Windows 10 2004 10.0.19041.1288; Microsoft Windows 10 20H2 10.0.19042.1288; Microsoft Windows 10 21H1 10.0.19043.1288; Microsoft Windows Server 2019 10.0.17763.2237; Microsoft Windows Server version 2004 10.0.19041.1288; Microsoft Windows Server version 20H2 10.0.19042.1288. Check the vendor advisory for mitigations.

References

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