What is CVE-2020-27824?

CVE-2020-27824 is a medium-severity vulnerability in Uclouvain Openjpeg, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2021-05-13.

How severe is CVE-2020-27824?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2020-27824 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Uclouvain Openjpeg

CVE-2020-27824

A flaw was found in OpenJPEG’s encoder in the opj_dwt_calc_explicit_stepsizes() function. This flaw allows an attacker who can supply crafted input to decomposition levels to cause a buffer overflow. The highest threat from this vulnerability is to system availability.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2021-05-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.016 (75.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Uclouvain Openjpeg
Debian Linux — versions 9.0, 10.0
Fedoraproject Fedora — versions 32, 33
Red Hat Enterprise Linux — versions 8.0
Openjpeg — versions openjpeg 2.4.0

Weakness classification (CWE)

Public proof-of-concept exploits

References

lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
lists.debian.org/debian-lts-announce/2021/02/msg00011.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2021/dsa-4882 (vendor-advisory, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Patch, Third Party Advisory, Issue Tracking)
www.oracle.com/security-alerts/cpuoct2021.html (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27824?: CVE-2020-27824 is a medium-severity vulnerability in Uclouvain Openjpeg, classified under Improper Input Validation. CVSS score: 5.5/10. Published 2021-05-13.
How severe is CVE-2020-27824?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2020-27824 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.