CVE-2020-6851: Debian Linux

High severity, CVSS 7.5. EPSS: 5.2% chance of exploitation in the next 30 days.

OpenJPEG through 2.3.1 has a heap-based buffer overflow in opj_t1_clbl_decode_processor in openjp2/t1.c because of lack of opj_j2k_update_image_dimensions validation.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only; version 10.0 only
• Fedoraproject Fedora: version 30 only; version 31 only
• Oracle Georaster: version 18c only
• Oracle Outside In Technology: version 8.5.4 only; version 8.5.5 only
• Red Hat Enterprise Linux: version 8.0 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Eus: version 7.7 only; version 8.1 only; version 8.2 only; version 8.4 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.7 only; version 8.2 only; version 8.4 only
• Red Hat Enterprise Linux Server Tus: version 7.7 only; version 8.2 only; version 8.4 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Uclouvain Openjpeg: up to and including 2.3.1

Published 2020-01-13. Last modified 2026-09-22.