CVE-2021-20309

Name: CVE-2021-20309
Creator: NVD / NIST
Published: 2021-05-11T23:15:08.72+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.31%

Last modified Jun 17, 2026

CVE-2021-20309 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A flaw was found in ImageMagick in versions before 7.0.11 and before 6.9.12, where a division by zero in WaveImage() of MagickCore/visual-effects.c may trigger undefined behavior via a crafted image file submitted to an application using ImageMagick. The highest threat from this vulnerability is to system availability.. EPSS estimates a 2.31% chance of exploitation in the next 30 days.

Description

A flaw was found in ImageMagick in versions before 7.0.11 and before 6.9.12, where a division by zero in WaveImage() of MagickCore/visual-effects.c may trigger undefined behavior via a crafted image file submitted to an application using ImageMagick. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.31%

81.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-369

Affected Software

Vendor	Product	Versions
Imagemagick	Imagemagick	< 6.9.12
Imagemagick	Imagemagick	>= 7.0.0-0, < 7.0.11-0
Debian	Debian Linux	9.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1946722Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00000.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00020.html
https://bugzilla.redhat.com/show_bug.cgi?id=1946722Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00000.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00020.html

Timeline

Published: May 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20309?

How severe is CVE-2021-20309?

CVE-2021-20309 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.31% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20309?

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-2021-20309?

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

Scan your code now

Source: NVD / NIST