CVE-2020-21697

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-08-10 · updated 2026-06-17
Weakness: CWE-416

Description

A heap-use-after-free in the mpeg_mux_write_packet function in libavformat/mpegenc.c of FFmpeg 4.2 allows to cause a denial of service (DOS) via a crafted avi file.

Affected products

Debian Linux: 11.0
FFmpeg: 4.2

References

https://trac.ffmpeg.org/ticket/8188
https://www.debian.org/security/2021/dsa-4998
https://trac.ffmpeg.org/ticket/8188
https://www.debian.org/security/2021/dsa-4998

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