CVE-2021-33815

Name: CVE-2021-33815
Creator: NVD / NIST
Published: 2021-06-03T17:15:15.073+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.36%

Last modified Jun 17, 2026

CVE-2021-33815 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. dwa_uncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dc_count is not strictly checked.. EPSS estimates a 1.36% chance of exploitation in the next 30 days.

Description

dwa_uncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dc_count is not strictly checked.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.36%

68.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-129

Affected Software

Vendor	Product	Versions
Ffmpeg	Ffmpeg	4.4

References

https://github.com/FFmpeg/FFmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777Patch, Third Party Advisory
https://security.gentoo.org/glsa/202312-14
https://github.com/FFmpeg/FFmpeg/commit/26d3c81bc5ef2f8c3f09d45eaeacfb4b1139a777Patch, Third Party Advisory
https://security.gentoo.org/glsa/202312-14

Timeline

Published: Jun 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33815?

dwa_uncompress in libavcodec/exr.c in FFmpeg 4.4 allows an out-of-bounds array access because dc_count is not strictly checked.

How severe is CVE-2021-33815?

CVE-2021-33815 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.36% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33815?

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-2021-33815?

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

Scan your code now

Source: NVD / NIST