CVE-2020-27824: Debian Linux

Medium severity, CVSS 5.5. EPSS: 1.6% chance of exploitation in the next 30 days.

A flaw was found in OpenJPEG’s encoder in the opj_dwt_calc_explicit_stepsizes() function. This flaw allows an attacker who can supply crafted input to decomposition levels to cause a buffer overflow. The highest threat from this vulnerability is to system availability.

Affected products

• Debian Debian Linux: version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 32 only; version 33 only
• Red Hat Enterprise Linux: version 8.0 only
• Uclouvain Openjpeg: before 2.4.0 (fixed in 2.4.0)

Published 2021-05-13. Last modified 2026-06-17.