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Fencer Vulns
high 7.8

CVE-2020-27844 json

A flaw was found in openjpeg's src/lib/openjp2/t2.c in versions prior to 2.4.0.

published 2021-01-05 5 y ago modified 2026-07-25 3 mo ago also EUVD-2020-20342 , JLSEC-2026-541

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

A flaw was found in openjpeg's src/lib/openjp2/t2.c in versions prior to 2.4.0. This flaw allows an attacker to provide crafted input to openjpeg during conversion and encoding, causing an out-of-bounds write. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Patch / fix

  • julia OpenJpeg_jll 2.4.0+0
  • uclouvain openjpeg 2.4.0
  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • chromium Package Hub 15 SP2 89.0.4389.72-bp152.2.62.1
  • chromium openSUSE Leap 15.2 89.0.4389.72-lp152.2.77.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2021:0401-1openSUSE-SU-2021:0392-1

  • chromium Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 89.0.4389.72-r0
  • openjpeg Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 2.4.0-r0
  • qt5-qtwebengine Alpine 3.23, Alpine 3.22, Alpine 3.21 +7 more 5.15.3_git20200401-r0

alpine advisories ALPINE-CVE-2020-27844

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium Arch Linux 89.0.4389.72-1
  • vivaldi Arch Linux 3.7.2218.45-1

arch linux advisories AVG-1631AVG-1633

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-2020-27844 updated cvss 7.8

openjpeg: heap-based buffer overflow 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: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 openjpeg2, openjpeg2-tools
    not affected: vulnerable code not present

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

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 8.3 AV:N/AC:M/Au:N/C:P/I:P/A:C
OSV 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/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
  • CWE-20 Improper Input Validation

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.