CVE-2021-20300

Name: CVE-2021-20300
Creator: NVD / NIST
Published: 2022-03-04T18:15:07.867+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.89%

Last modified Jun 17, 2026

CVE-2021-20300 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A flaw was found in OpenEXR's hufUncompress functionality in OpenEXR/IlmImf/ImfHuf.cpp. This flaw allows an attacker who can submit a crafted file that is processed by OpenEXR, to trigger an integer overflow. EPSS estimates a 0.89% chance of exploitation in the next 30 days.

Description

A flaw was found in OpenEXR's hufUncompress functionality in OpenEXR/IlmImf/ImfHuf.cpp. This flaw allows an attacker who can submit a crafted file that is processed by OpenEXR, to trigger an integer overflow. The highest threat from this vulnerability is to system availability.

Metrics

CVSS 3.1

5.5/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

EPSS Probability

0.89%

54.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Openexr	Openexr	< 2.5.4
Debian	Debian Linux	10.0

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25562Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939153Issue Tracking, Third Party Advisory
https://github.com/AcademySoftwareFoundation/openexr/pull/836Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00022.htmlMailing List, Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=25562Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939153Issue Tracking, Third Party Advisory
https://github.com/AcademySoftwareFoundation/openexr/pull/836Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00022.htmlMailing List, Third Party Advisory

Timeline

Published: Mar 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-20300?

How severe is CVE-2021-20300?

CVE-2021-20300 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.89% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20300?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20300?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST