CVE-2020-6851

HIGHNVD 7.57.5—

7.5

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 v3: 7.5
EG Score: 7.5(medium)
EPSS: 89.7%
KEV: Not listed

Published

January 13, 2020

Last Modified

November 21, 2024

References (20)

cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0262
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0274
cve@mitrehttps://access.redhat.com/errata/RHSA-2020:0296
cve@mitrehttps://github.com/uclouvain/openjpeg/issues/1228
cve@mitrehttps://lists.debian.org/debian-lts-announce/2020/01/msg00025.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2020/07/msg00008.html
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LACIIDDCKZJEPKTTFILSOSBQL7L3FC6V/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XBRMI2D3XPVWKE3V52KRBW7BJVLS5LD3/
cve@mitrehttps://www.debian.org/security/2021/dsa-4882
cve@mitrehttps://www.oracle.com/security-alerts/cpujul2020.html
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2020:0262
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2020:0274
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2020:0296
af854a3a-2127-422b-91ae-364da2661108https://github.com/uclouvain/openjpeg/issues/1228
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/01/msg00025.html

Patch Availability(6)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libgs9-common (9.26~dfsg+0-0ubuntu0.16.04.14) @ xenial	2026-05-27	ubuntu
ubuntu	libopenjpip7 (2.1.2-1.1+deb9u5build0.16.04.1) @ xenial	2026-05-27	ubuntu
ubuntu	libopenjpip-dec-server (2.1.2-1.1+deb9u6ubuntu0.1~esm3) @ xenial	2026-05-27	ubuntu
redhat	openjpeg2-0:2.3.0-9.el8_0	2020-01-30	redhat
redhat	openjpeg2-0:2.3.1-2.el8_1	2020-01-29	redhat
redhat	openjpeg2-0:2.3.1-2.el7_7	2020-01-28	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-787Out-of-bounds Write

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-05 06:08 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2020-6851?

CVE-2020-6851 is a high vulnerability published on January 13, 2020. OpenJPEG through 2.3.1 has a heap-based buffer overflow in opjt1clbldecodeprocessor in openjp2/t1.c because of lack of opjj2kupdateimagedimensions validation.

When was CVE-2020-6851 disclosed?

CVE-2020-6851 was first published in the National Vulnerability Database on January 13, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-6851 actively exploited?

CVE-2020-6851 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-6851?

CVE-2020-6851 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2020-6851?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-6851, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-6851

Explore →

Is Your Infrastructure Affected by CVE-2020-6851?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2020-6851

Published

Last Modified

References (20)

Patch Availability(6)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-6851?

Same vendor

Same CWE

CVE-2020-6851

📅 Published

🔄 Last Modified

🔗 References (20)

Patch Availability(6)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-6851?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (20)

Frequently asked(5)

Related CVEs(same vendor + same CWE)