VULNERABILITY INTELLIGENCE

CVE-2021-3566

CVSS score5.5 MEDIUM

EPSS probability0.88%

CISA KEVNot currently listed

Published2021-08-05

Last modified2026-06-17

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

Description

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).

Weakness classification

patrick@puiterwijk.org: CWE-200
nvd@nist.gov: NVD-CWE-noinfo

Primary references

patrick@puiterwijk.org — Patch, Third Party Advisory
patrick@puiterwijk.org — Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory