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Vulnerability record · CVE-2020-6851 · published 13 January 2020

CVE-2020-6851: Uclouvain openjpeg out-of-bounds write vulnerability

UUclouvain · Openjpeg

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.

7.5 CVSS 3.1 High EPSS 5.2% · top 7.8% CWE-787 · Out-of-bounds write
7.5CVSS 3.1 base score, v2 5.0
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
12Affected product versions listed by NVD
21References, 2 tagged exploit
22 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

12 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2020:0262 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0274 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0296 Third Party Advisory
https://github.com/uclouvain/openjpeg/issues/1228 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/01/msg00025.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00008.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LACIIDDCKZJEPKTTFILSOSB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XBRMI2D3XPVWKE3V52KRBW7
https://www.debian.org/security/2021/dsa-4882 Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html PatchThird Party Advisory
http://www.openwall.com/lists/oss-security/2026/09/22/6
https://access.redhat.com/errata/RHSA-2020:0262 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0274 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0296 Third Party Advisory
https://github.com/uclouvain/openjpeg/issues/1228 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/01/msg00025.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00008.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LACIIDDCKZJEPKTTFILSOSB
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XBRMI2D3XPVWKE3V52KRBW7
https://www.debian.org/security/2021/dsa-4882 Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-6851), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.