CVE-2021-20311

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-05-11 · updated 2026-06-17
Weakness: CWE-369

Description

A flaw was found in ImageMagick in versions before 7.0.11, where a division by zero in sRGBTransformImage() in the MagickCore/colorspace.c may trigger undefined behavior via a crafted image file that is submitted by an attacker processed by an application using ImageMagick. The highest threat from this vulnerability is to system availability.

Affected products

ImageMagick: before 7.0.11-0 — fixed in 7.0.11-0

How to fix

Upgrade to a fixed version: ImageMagick 7.0.11-0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1946739
https://bugzilla.redhat.com/show_bug.cgi?id=1946739

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