What is CVE-2020-27843?

CVE-2020-27843 is a medium-severity vulnerability in Oracle Outside In Technology, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2021-01-05.

How severe is CVE-2020-27843?

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

Is CVE-2020-27843 known to be exploited?

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

Out-of-bounds Read in Oracle Outside In Technology

CVE-2020-27843

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.

Vulnerability class: Buffer Overflow

Published 2021-01-05 · 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: 0.018 (77.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.001

Affected products

Oracle Outside In Technology — versions 8.5.5
Uclouvain Openjpeg
Debian Linux — versions 9.0, 10.0
Fedoraproject Fedora — versions 32, 33
Openjpeg — versions openjpeg 2.4.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

Public proof-of-concept exploits

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
security.gentoo.org/glsa/202101-29 (vendor-advisory, Third Party Advisory)
www.debian.org/security/2021/dsa-4882 (vendor-advisory, Third Party Advisory)
www.oracle.com/security-alerts/cpuApr2021.html (Patch, Third Party Advisory)
www.oracle.com//security-alerts/cpujul2021.html (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2022/04/msg00006.html (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2020-27843?: CVE-2020-27843 is a medium-severity vulnerability in Oracle Outside In Technology, classified under Out-of-bounds Read. CVSS score: 5.5/10. Published 2021-01-05.
How severe is CVE-2020-27843?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2020-27843 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.