{"id":"CVE-2021-38171","details":"adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4 does not check the init_get_bits return value, which is a necessary step because the second argument to init_get_bits can be crafted.","modified":"2026-08-17T05:26:22.558036Z","published":"2021-08-21T17:15:07.700Z","related":["SUSE-SU-2021:3193-1","SUSE-SU-2021:3212-1","openSUSE-SU-2021:3193-1","openSUSE-SU-2024:10754-1"],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"9.0"},{"last_affected":"9.0"},{"introduced":"10.0"},{"last_affected":"10.0"},{"introduced":"11.0"},{"last_affected":"11.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"}]},"references":[{"type":"WEB","url":"https://patchwork.ffmpeg.org/project/ffmpeg/patch/AS8P193MB12542A86E22F8207EC971930B6F19%40AS8P193MB1254.EURP193.PROD.OUTLOOK.COM/"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2021/11/msg00012.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202312-14"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4990"},{"type":"ADVISORY","url":"https://www.debian.org/security/2021/dsa-4998"},{"type":"FIX","url":"https://github.com/FFmpeg/FFmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.ffmpeg.org/ffmpeg.git","events":[{"introduced":"c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"},{"last_affected":"c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"}],"database_specific":{"cpe":"cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*","extracted_events":[{"introduced":"4.4"},{"last_affected":"4.4"}],"source":"CPE_STRING"}}],"versions":["4.4","n4.4-dev"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38171.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/ffmpeg/ffmpeg","events":[{"introduced":"c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"},{"last_affected":"c5079bf3bccd24bf8ed45ff47ff4071fd09e9fd8"},{"fixed":"9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6"}],"database_specific":{"cpe":"cpe:2.3:a:ffmpeg:ffmpeg:4.4:*:*:*:*:*:*:*","extracted_events":[{"introduced":"4.4"},{"last_affected":"4.4"}],"source":["CPE_STRING","REFERENCES"]}}],"versions":["4.4","n4.5-dev","n4.4-dev"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-38171.json","vanir_signatures_modified":"2026-08-17T05:26:22Z","vanir_signatures":[{"signature_type":"Line","signature_version":"v1","source":"https://github.com/ffmpeg/ffmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6","target":{"file":"libavformat/adtsenc.c"},"deprecated":false,"digest":{"line_hashes":["340113475355395989559555410026913520501","137990287974201680121919945555266282413","104727278381930846197606427839919055206","306440550592068726656414586700004213449","111695304590519358973522263762808409562"],"threshold":0.9},"id":"CVE-2021-38171-e3cbe9ce"},{"digest":{"function_hash":"220551853458764014735923732241586144836","length":1445},"id":"CVE-2021-38171-e6f862de","signature_type":"Function","signature_version":"v1","source":"https://github.com/ffmpeg/ffmpeg/commit/9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6","target":{"file":"libavformat/adtsenc.c","function":"adts_decode_extradata"},"deprecated":false}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}