CVE-2020-27841 Memory corruption in openjpeg

What is CVE-2020-27841?

CVE-2020-27841 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 5 Jan 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

There's a flaw in openjpeg in versions prior to 2.4.0 in src/lib/openjp2/pi.c. When an attacker is able to provide crafted input to be processed by the openjpeg encoder, this could cause an out-of-bounds read. The greatest impact from this flaw is to application availability.

Weakness: CWE-787, CWE-122

Which versions are affected by CVE-2020-27841?

It affects 4 products.

Products include Debian Debian Linux, Fedoraproject Fedora, Oracle Outside in Technology, Uclouvain Openjpeg.

How do I fix CVE-2020-27841?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-27841 being exploited?

There is no known exploitation of CVE-2020-27841 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-45006, DEBIAN-CVE-2020-27841, GHSA-7hw5-f79p-8gpg, JLSEC-2026-538, UBUNTU-CVE-2020-27841.