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CVE-2021-34521: Raw Image Extension Remote Code Execution Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-07-14 · updated 2026-08-10

Description

Raw Image Extension Remote Code Execution Vulnerability

Affected products

• Microsoft Windows 10 Version 1607: 20h2, 21h1, 1909
• Microsoft Windows Server 2016: 20h2
• Microsoft Windows 10 1909: from 10.0.0 before 10.0.18363.1679 — fixed in 10.0.18363.1679
• Microsoft Windows 10 20H2: from 10.0.0 before 10.0.19042.1110 — fixed in 10.0.19042.1110
• Microsoft Windows 10 21H1: from 10.0.0 before 10.0.19043.1110 — fixed in 10.0.19043.1110
• Microsoft Windows Server version 20H2: from 10.0.0 before 10.0.19042.1110 — fixed in 10.0.19042.1110

How to fix

Upgrade to a fixed version: Microsoft Windows 10 1909 10.0.18363.1679; Microsoft Windows 10 20H2 10.0.19042.1110; Microsoft Windows 10 21H1 10.0.19043.1110; Microsoft Windows Server version 20H2 10.0.19042.1110. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34521
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34521

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