CVE-2021-20303

Name: CVE-2021-20303
Creator: NVD / NIST
Published: 2022-03-04T18:15:07.993+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.79%

Last modified Jun 17, 2026

CVE-2021-20303 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. A flaw found in function dataWindowForTile() of IlmImf/ImfTiledMisc.cpp. An attacker who is able to submit a crafted file to be processed by OpenEXR could trigger an integer overflow, leading to an out-of-bounds write on the heap. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

Description

A flaw found in function dataWindowForTile() of IlmImf/ImfTiledMisc.cpp. An attacker who is able to submit a crafted file to be processed by OpenEXR could trigger an integer overflow, leading to an out-of-bounds write on the heap. The greatest impact of this flaw is to application availability, with some potential impact to data integrity as well.

Metrics

CVSS 3.1

6.1/10

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

EPSS Probability

0.79%

51.6th 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=25505Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939151Issue Tracking, Vendor Advisory
https://github.com/AcademySoftwareFoundation/openexr/pull/831Patch, 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=25505Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939151Issue Tracking, Vendor Advisory
https://github.com/AcademySoftwareFoundation/openexr/pull/831Patch, 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-2021-20303?

How severe is CVE-2021-20303?

CVE-2021-20303 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.

How do I fix CVE-2021-20303?

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-2021-20303?

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

Scan your code now

Source: NVD / NIST