CVE-2020-6851
Medium
Elevated severity or exploit probability.
CVSS base
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — probability of exploitation (30 days)
5.2%
92.2th percentile
CISA KEV
Not listed
Weakness / dates
CWE-787
Published 2020-01-13 · modified 2026-09-22
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | N | None |
| Integrity | N | None |
| Availability | H | High |
Timeline
- 2020-01-13 — Published (NVD)
- 2026-09-22 — Last modified (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.
Affected
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
- exploit 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
- https://access.redhat.com/errata/RHSA-2020:0274
- https://access.redhat.com/errata/RHSA-2020:0296
- exploit 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