CVE-2020-27844

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-01-05 · updated 2026-06-17
Weakness: CWE-20

Description

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.

Affected products

Debian Linux: 9.0
Oracle Corporation Outside In Technology: 8.5.5
uclouvain openjpeg: before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: uclouvain openjpeg 2.4.0. Check the vendor advisory for mitigations.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1907521
https://lists.debian.org/debian-lts-announce/2021/02/msg00011.html
https://security.gentoo.org/glsa/202101-29
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuApr2021.html
https://bugzilla.redhat.com/show_bug.cgi?id=1907521
https://lists.debian.org/debian-lts-announce/2021/02/msg00011.html
https://security.gentoo.org/glsa/202101-29
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuApr2021.html

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