CVE-2021-3476

Name: CVE-2021-3476
Creator: NVD / NIST
Published: 2021-03-30T18:15:18.077+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.85%

Last modified Jun 17, 2026

CVE-2021-3476 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A flaw was found in OpenEXR's B44 uncompression functionality in versions before 3.0.0-beta. An attacker who is able to submit a crafted file to OpenEXR could trigger shift overflows, potentially affecting application availability.. EPSS estimates a 1.85% chance of exploitation in the next 30 days.

Description

A flaw was found in OpenEXR's B44 uncompression functionality in versions before 3.0.0-beta. An attacker who is able to submit a crafted file to OpenEXR could trigger shift overflows, potentially affecting application availability.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

1.85%

76.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-190

Affected Software

Vendor	Product	Versions
Openexr	Openexr	< 2.4.3
Openexr	Openexr	>= 2.5.0, < 2.5.4
Debian	Debian Linux	9.0
Debian	Debian Linux	10.0

References

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24787Issue Tracking, Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939145Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00001.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00022.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202107-27Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24787Issue Tracking, Mailing List, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1939145Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/07/msg00001.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00022.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202107-27Third Party Advisory

Timeline

Published: Mar 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3476?

How severe is CVE-2021-3476?

CVE-2021-3476 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.85% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3476?

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-2021-3476?

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

Scan your code now

Source: NVD / NIST