{"api_version":"1","generated_at":"2026-04-23T07:57:07+00:00","cve":"CVE-2021-3566","urls":{"html":"https://cve.report/CVE-2021-3566","api":"https://cve.report/api/cve/CVE-2021-3566.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-3566","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3566"},"summary":{"title":"CVE-2021-3566","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).","state":"PUBLIC","assigner":"patrick@puiterwijk.org","published_at":"2021-08-05 21:15:00","updated_at":"2022-12-21 15:01:00"},"problem_types":["NVD-CWE-noinfo"],"metrics":[],"references":[{"url":"https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f","name":"https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f","refsource":"MISC","tags":[],"title":"avformat/tty: add probe function · FFmpeg/FFmpeg@3bce9e9 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html","name":"[debian-lts-announce] 20210815 [SECURITY] [DLA 2742-1] ffmpeg security update","refsource":"MLIST","tags":[],"title":"[SECURITY] [DLA 2742-1] ffmpeg security update","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-3566","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3566","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"3566","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"debian","cpe5":"debian_linux","cpe6":"9.0","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2021","cve_id":"3566","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"ffmpeg","cpe5":"ffmpeg","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-3566","qid":"178763","title":"Debian Security Update for ffmpeg (DLA 2742-1)"},{"cve":"CVE-2021-3566","qid":"179513","title":"Debian Security Update for ffmpeg (CVE-2021-3566)"},{"cve":"CVE-2021-3566","qid":"751277","title":"OpenSUSE Security Update for ffmpeg (openSUSE-SU-2021:3521-1)"},{"cve":"CVE-2021-3566","qid":"753502","title":"SUSE Enterprise Linux Security Update for ffmpeg (SUSE-SU-2023:0005-1)"}]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2021-3566","ASSIGNER":"patrick@puiterwijk.org","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"ffmpeg","version":{"version_data":[{"version_value":"ffmpeg 4.3"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-200"}]}]},"references":{"reference_data":[{"refsource":"MISC","name":"https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f","url":"https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532#diff-74f6b92a0541378ad15de9c29c0a2b0c69881ad9ffc71abe568b88b535e00a7f"},{"refsource":"MLIST","name":"[debian-lts-announce] 20210815 [SECURITY] [DLA 2742-1] ffmpeg security update","url":"https://lists.debian.org/debian-lts-announce/2021/08/msg00018.html"}]},"description":{"description_data":[{"lang":"eng","value":"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)."}]}},"nvd":{"publishedDate":"2021-08-05 21:15:00","lastModifiedDate":"2022-12-21 15:01:00","problem_types":["NVD-CWE-noinfo"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":5.5,"baseSeverity":"MEDIUM"},"exploitabilityScore":1.8,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:N/A:N","accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3},"severity":"MEDIUM","exploitabilityScore":8.6,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*","versionEndExcluding":"4.3","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"3566","Ordinal":"208980","Title":"CVE-2021-3566","CVE":"CVE-2021-3566","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"3566","Ordinal":"1","NoteData":"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).","Type":"Description","Title":null},{"CveYear":"2021","CveId":"3566","Ordinal":"2","NoteData":"2021-08-05","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"3566","Ordinal":"3","NoteData":"2021-08-15","Type":"Other","Title":"Modified"}]}}}