CVE-2021-3566 Affecting ffmpeg package, versions <7:2.8.17-0ubuntu0.1+esm4


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.88% (55th percentile)

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  • Snyk IDSNYK-UBUNTU1604-FFMPEG-1614506
  • published22 Mar 2026
  • disclosed5 Aug 2021

Introduced: 5 Aug 2021

CVE-2021-3566  (opens in a new tab)

How to fix?

Upgrade Ubuntu:16.04 ffmpeg to version 7:2.8.17-0ubuntu0.1+esm4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream ffmpeg package and not the ffmpeg package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

Prior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim (as long as the -vcodec copy option is passed to ffmpeg).

CVSS Base Scores

version 3.1