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Fencer Vulns
medium 5.5

CVE-2020-27843 json

A flaw was found in OpenJPEG in versions prior to 2.4.0.

published 2021-01-05 5 y ago modified 2026-07-18 3 mo ago also EUVD-2020-20341 , JLSEC-2026-540

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

A flaw was found in OpenJPEG in versions prior to 2.4.0. This flaw allows an attacker to provide specially crafted input to the conversion or encoding functionality, causing an out-of-bounds read. The highest threat from this vulnerability is system availability.

Patch / fix

  • julia OpenJpeg_jll 2.4.0+0
  • uclouvain openjpeg 2.4.0
  • openjpeg2 Debian 14, Debian 13, Debian 12 2.4.0-1

debian advisories DEBIAN-CVE-2020-27843

  • openjpeg2 Ubuntu 20.04 LTS 2.3.1-1ubuntu4.20.04.1
  • openjpeg2 Ubuntu 22.04 LTS 2.3.1-1ubuntu5
  • ghostscript Ubuntu 16.04 LTS 9.26~dfsg+0-0ubuntu0.16.04.14
  • ghostscript Ubuntu 18.04 LTS 9.26~dfsg+0-0ubuntu0.18.04.14
  • openjpeg2 Ubuntu Pro 16.04 LTS 2.1.2-1.1+deb9u6ubuntu0.1~esm3

ubuntu advisories UBUNTU-CVE-2020-27843

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • openjpeg2 RHEL 8 2.4.0-4.el8
  • openjpeg2-tools RHEL 8 2.4.0-4.el8

red hat advisories RHSA-2021:4251

  • openjpeg SLES for SAP 15, SLES 15-LTSS, SLES 15 SP2-BCL +9 more 1.5.2-150000.4.10.1
  • openjpeg2 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +21 more 2.3.0-150000.3.8.1
  • openjpeg2 SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +5 more 2.1.0-4.18.2

suse advisories SUSE-SU-2022:4082-1SUSE-SU-2022:3802-1SUSE-SU-2022:3801-1

  • openjpeg2 AlmaLinux 8 2.4.0-4.el8
  • openjpeg2-tools AlmaLinux 8 2.4.0-4.el8

almalinux advisories ALSA-2021:4251

  • openjpeg2 Rocky Linux 8 2.4.0-4.el8

rocky linux advisories RLSA-2021:4251

  • openjpeg2 Azure Linux 3.0 2.3.1-12

azure linux advisories AZL-45333

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • openjpeg2 Arch Linux 2.4.0-1

arch linux advisories AVG-1339

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-27843 updated cvss 5.5

openjpeg: out-of-bounds read in opj_t2_encode_packet function in openjp2/t2.c

  • Red Hat Enterprise Linux 6 openjpeg, openjpeg-libs Red Hat Enterprise Linux 7 openjpeg, openjpeg2, openjpeg-libs, openjpeg2-tools
    affected: no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) openjpeg2-tools 2.4.0-4.el8 Red Hat Enterprise Linux AppStream (v. 8) openjpeg2 2.4.0-4.el8, openjpeg2-tools 2.4.0-4.el8
    fixed: vendor fix RHSA-2021:4251

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.70% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C
OSV 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
julia OpenJpeg_jll
<2.4.0+0
2.4.0+0

Affected products

  • n/a openjpeg

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.