What’s Vulnerable › Vulnerabilities

CVE-2020-27756

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-12-08 · updated 2026-06-17
• Weakness: CWE-369

Description

In ParseMetaGeometry() of MagickCore/geometry.c, image height and width calculations can lead to divide-by-zero conditions which also lead to undefined behavior. This flaw can be triggered by a crafted input file processed by ImageMagick and could impact application availability. The patch uses multiplication in addition to the function `PerceptibleReciprocal()` in order to prevent such divide-by-zero conditions. This flaw affects ImageMagick versions prior to 7.0.9-0.

Affected products

• ImageMagick: from 6.9.9-34 before 6.9.10-69; from 7.0.0-0 before 7.0.9-0 — fixed in 6.9.10-69, 7.0.9-0

How to fix

Upgrade to a fixed version: ImageMagick 6.9.10-69, 7.0.9-0. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1894233
• https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html
• https://bugzilla.redhat.com/show_bug.cgi?id=1894233
• https://lists.debian.org/debian-lts-announce/2023/03/msg00008.html

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