CVE-2021-20312: Debian Linux

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

A flaw was found in ImageMagick in versions 7.0.11, where an integer overflow in WriteTHUMBNAILImage of coders/thumbnail.c may trigger undefined behavior via a crafted image file that is submitted by an attacker and processed by an application using ImageMagick. The highest threat from this vulnerability is to system availability.

Affected products

• Debian Debian Linux: version 9.0 only
• ImageMagick ImageMagick: before 7.0.11-0 (fixed in 7.0.11-0)

Published 2021-05-11. Last modified 2026-06-17.