CVE-2021-3566
5.5 MEDIUMPrior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it
Published: 2021-08-05 · Last updated: 2026-06-17
Severity and scoring
- CVSS
- 5.5 MEDIUM
- Vector
- CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CWE
- CWE-200
Affected products
| Vendor | Product |
|---|---|
| debian | debian_linux, ffmpeg |
| ffmpeg | debian_linux, ffmpeg |
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).
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-3566
- [Patch]https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f
- [Other]https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html
- [Patch]https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f
- [Other]https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html
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