{"id":"UBUNTU-CVE-2021-3566","details":"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).","modified":"2026-04-22T12:56:05.599150Z","published":"2021-08-05T21:15:00Z","related":["USN-5167-1"],"upstream":["CVE-2021-3566"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3566"},{"type":"REPORT","url":"https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5167-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3566"}],"affected":[{"package":{"name":"ffmpeg","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/ffmpeg@7:2.8.17-0ubuntu0.1+esm4?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"7:2.8.17-0ubuntu0.1+esm4"}]}],"versions":["7:2.7.2-1build1","7:2.8.1-1ubuntu1","7:2.8.2-1ubuntu1","7:2.8.3-1","7:2.8.4-1","7:2.8.4-1ubuntu1","7:2.8.4-1ubuntu2","7:2.8.4-1ubuntu3","7:2.8.4-1ubuntu4","7:2.8.6-1ubuntu1","7:2.8.6-1ubuntu2","7:2.8.8-0ubuntu0.16.04.1","7:2.8.10-0ubuntu0.16.04.1","7:2.8.11-0ubuntu0.16.04.1","7:2.8.14-0ubuntu0.16.04.1","7:2.8.15-0ubuntu0.16.04.1","7:2.8.15-0ubuntu0.16.04.1+esm1","7:2.8.17-0ubuntu0.1","7:2.8.17-0ubuntu0.1+esm1","7:2.8.17-0ubuntu0.1+esm2","7:2.8.17-0ubuntu0.1+esm3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"ffmpeg","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libav-tools","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libavcodec-extra","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libavcodec-ffmpeg-extra56","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libavcodec-ffmpeg56","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libavdevice-ffmpeg56","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_version":"7:2.8.17-0ubuntu0.1+esm4","binary_name":"libavfilter-ffmpeg5"},{"binary_version":"7:2.8.17-0ubuntu0.1+esm4","binary_name":"libavformat-ffmpeg56"},{"binary_name":"libavresample-ffmpeg2","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libavutil-ffmpeg54","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libpostproc-ffmpeg53","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libswresample-ffmpeg1","binary_version":"7:2.8.17-0ubuntu0.1+esm4"},{"binary_name":"libswscale-ffmpeg3","binary_version":"7:2.8.17-0ubuntu0.1+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3566.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}