CVE-2021-34521

Name: CVE-2021-34521
Creator: NVD / NIST
Published: 2021-07-14T18:15:12.287+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 2.18%

Last modified Jun 17, 2026

CVE-2021-34521 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Raw Image Extension Remote Code Execution Vulnerability. EPSS estimates a 2.18% chance of exploitation in the next 30 days.

Description

Raw Image Extension Remote Code Execution Vulnerability

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

2.18%

80.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Windows 10	20h2
Microsoft	Windows 10	21h1
Microsoft	Windows 10	1909
Microsoft	Windows Server 2016	20h2

References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34521Patch, Vendor Advisory
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34521Patch, Vendor Advisory

Timeline

Published: Jul 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-34521?

Raw Image Extension Remote Code Execution Vulnerability

How severe is CVE-2021-34521?

CVE-2021-34521 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 2.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-34521?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34521?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST