CVE-2020-21697

NameCVE-2020-21697
DescriptionA 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDSA-4998-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ffmpeg (PTS)stretch7:3.2.14-1~deb9u1vulnerable
stretch (security)7:3.2.16-1+deb9u1vulnerable
buster7:4.1.6-1~deb10u1vulnerable
buster (security)7:4.1.8-0+deb10u1vulnerable
bullseye (security), bullseye7:4.3.3-0+deb11u1fixed
bookworm, sid7:4.4.1-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ffmpegsourcebullseye7:4.3.3-0+deb11u1DSA-4998-1
ffmpegsource(unstable)7:4.4-5

Notes

[buster] - ffmpeg <postponed> (Wait for 4.1.9)
[stretch] - ffmpeg <postponed> (Minor issue; can be fixed in next update)
https://trac.ffmpeg.org/ticket/8188
http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=cfce16449cb815132f829d5a07beb138dfb2cba6

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