CVE-2021-20224

Name: CVE-2021-20224
Creator: NVD / NIST
Published: 2022-08-25T20:15:08.873+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2021-20224 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. An integer overflow issue was discovered in ImageMagick's ExportIndexQuantum() function in MagickCore/quantum-export.c. Function calls to GetPixelIndex() could result in values outside the range of representable for the 'unsigned char'. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

Description

An integer overflow issue was discovered in ImageMagick's ExportIndexQuantum() function in MagickCore/quantum-export.c. Function calls to GetPixelIndex() could result in values outside the range of representable for the 'unsigned char'. When ImageMagick processes a crafted pdf file, this could lead to an undefined behaviour or a crash.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.36%

28.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Imagemagick	Imagemagick	< 6.9.11-57
Imagemagick	Imagemagick	>= 7.0.0-0, < 7.0.10-57

References

https://github.com/ImageMagick/ImageMagick/commit/5af1dffa4b6ab984b5f13d1e91c95760d75f12a6Patch, Third Party Advisory
https://github.com/ImageMagick/ImageMagick/pull/3083Issue Tracking, Patch, Third Party Advisory
https://github.com/ImageMagick/ImageMagick6/commit/553054c1cb1e4e05ec86237afef76a32cd7c464dPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html
https://github.com/ImageMagick/ImageMagick/commit/5af1dffa4b6ab984b5f13d1e91c95760d75f12a6Patch, Third Party Advisory
https://github.com/ImageMagick/ImageMagick/pull/3083Issue Tracking, Patch, Third Party Advisory
https://github.com/ImageMagick/ImageMagick6/commit/553054c1cb1e4e05ec86237afef76a32cd7c464dPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html

Timeline

Published: Aug 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20224?

How severe is CVE-2021-20224?

CVE-2021-20224 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20224?

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-2021-20224?

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

Scan your code now

Source: NVD / NIST