What’s Vulnerable › Vulnerabilities

CVE-2020-6851

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-13 · updated 2026-09-22
• Weakness: CWE-787

Description

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 Linux: 8.0, 9.0, 10.0
• Fedoraproject Fedora: 30, 31
• Oracle Georaster: 18c
• Oracle Corporation Outside In Technology: 8.5.4, 8.5.5
• Red Hat Enterprise Linux: 8.0
• RedHat Enterprise Linux Desktop: 7.0
• RedHat Enterprise Linux Eus: 7.7, 8.1, 8.2, 8.4
• RedHat Enterprise Linux Server: 7.0
• RedHat Enterprise Linux Server Aus: 7.7, 8.2, 8.4
• RedHat Enterprise Linux Server Tus: 7.7, 8.2, 8.4
• RedHat Enterprise Linux Workstation: 7.0
• uclouvain openjpeg: through 2.3.1

References

• https://access.redhat.com/errata/RHSA-2020:0262
• https://access.redhat.com/errata/RHSA-2020:0274
• https://access.redhat.com/errata/RHSA-2020:0296
• https://github.com/uclouvain/openjpeg/issues/1228
• https://lists.debian.org/debian-lts-announce/2020/01/msg00025.html
• https://lists.debian.org/debian-lts-announce/2020/07/msg00008.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LACIIDDCKZJEPKTTFILSOSBQL7L3FC6V/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XBRMI2D3XPVWKE3V52KRBW7BJVLS5LD3/
• https://www.debian.org/security/2021/dsa-4882
• https://www.oracle.com/security-alerts/cpujul2020.html
• http://www.openwall.com/lists/oss-security/2026/09/22/6
• https://access.redhat.com/errata/RHSA-2020:0262

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