CVE-2021-33815 Memory corruption in n/a
An out-of-bounds array access in FFmpeg's EXR decoder allows attackers to cause memory corruption, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-33815?
CVE-2021-33815 is a high-severity memory corruption vulnerability in Ffmpeg Ffmpeg, published on 3 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-129
Which versions are affected by CVE-2021-33815?
It affects 1 product.
Products include Ffmpeg Ffmpeg.
How do I fix CVE-2021-33815?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2021-33815 being exploited?
There is no known exploitation of CVE-2021-33815 in the wild and no public exploit code.
Other vulnerabilities in Ffmpeg Ffmpeg
Sources
Also known as CLEANSTART-2024-LU46307, GHSA-gcpj-pp7m-cw8v, JLSEC-2025-114.