{"id":"CVE-2021-21417","aliases":["ALPINE-CVE-2021-21417","DEBIAN-CVE-2021-21417","DLA-2697-1","EUVD-2021-8704","GHSA-6fcq-pxhc-jxc9","MGASA-2021-0324","UBUNTU-CVE-2021-21417"],"status":"published","title":"Use after free in fluidsynth","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","severity":{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00944,"percentile":0.61515,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2021-04-29T17:10:15Z","modified":"2026-11-03T06:32:27Z","fixes":[{"ecosystem":"Alpine:v3.13","package":"fluidsynth","fixed_in":["2.1.8-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"fluidsynth","fixed_in":["2.1.7-1.1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"fluidsynth","fixed_in":["2.1.7-1.1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"fluidsynth","fixed_in":["2.1.7-1.1"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"fluidsynth","fixed_in":["1.1.6-4+deb9u1"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"fluidsynth","fixed_in":["2.0.5-1.1.mga7"],"sources":["osv"]},{"ecosystem":"Mageia:8","package":"fluidsynth","fixed_in":["2.1.8-1.mga8"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.13","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.8-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.7-1.1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.7-1.1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.7-1.1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.6-4+deb9u1"}]}],"versions":["1.1.6-4"]},{"source":"osv","ecosystem":"Mageia:7","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.5-1.1.mga7"}]}]},{"source":"osv","ecosystem":"Mageia:8","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.8-1.mga8"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.6-2","1.1.6-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.6-2build1","1.1.6-3","1.1.6-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.6-4","1.1.8-1","1.1.8-2","1.1.8-3","1.1.9-1","1.1.9-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.11-4","1.1.11-4ubuntu1","2.1.0-1","2.1.1-2","2.1.1-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"fluidsynth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.7-1.1","2.2.4-2","2.2.5-1","2.2.5-1ubuntu0.1~esm1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"fluidsynth","product":"fluidsynth"}],"references":[{"url":"https://github.com/FluidSynth/fluidsynth/issues/808","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence","report"]},{"url":"https://github.com/FluidSynth/fluidsynth/pull/810","tags":["x_refsource_MISC","x_transferred","Exploit","Issue Tracking","Patch","Third Party Advisory","fix"]},{"url":"https://github.com/FluidSynth/fluidsynth/security/advisories/GHSA-6fcq-pxhc-jxc9","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00027.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-21417","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-21417","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2021-0324.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=29051","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2021-21417","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-21417","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-21417","title":"Use after free in fluidsynth","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:10:15Z","modified":"2024-08-03T18:09:16.083Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:33:00.137099Z"}],"euvd":[{"id":"EUVD-2021-8704","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:10:15Z","modified":"2024-08-03T18:09:16Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-03T03:25:06.347262Z"}],"nvd":[{"id":"CVE-2021-21417","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:15:09.023Z","modified":"2026-06-17T03:35:32.1Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:06:52.81233Z"}],"osv":[{"id":"ALPINE-CVE-2021-21417","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:15:09.023Z","modified":"2026-11-03T06:32:27.339187016Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-03T07:17:57.723967Z"},{"id":"CVE-2021-21417","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:15:09.023Z","modified":"2026-10-20T14:14:51.929837944Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"DEBIAN-CVE-2021-21417","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:15:09.023Z","modified":"2026-10-23T18:03:49.099145391Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"UBUNTU-CVE-2021-21417","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications. A use after free violation was discovered in fluidsynth, that can be triggered when loading an invalid SoundFont file.","status":"published","published":"2021-04-29T17:15:00Z","modified":"2026-10-06T23:30:39.705511528Z","cvss":[{"version":"3.1","score":7.2,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N","level":"high"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:26.29421Z"},{"id":"DLA-2697-1","title":"fluidsynth - security update","status":"published","published":"2021-06-29T00:00:00Z","modified":"2026-03-09T01:22:34.896221Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"MGASA-2021-0324","title":"Updated fluidsynth packages fix a security vulnerability","description":"fluidsynth is a software synthesizer based on the SoundFont 2 specifications.\nA use after free violation was discovered in fluidsynth, that can be triggered\nwhen loading an invalid SoundFont file (CVE-2021-21417).\n","status":"published","published":"2021-07-09T00:27:08Z","modified":"2026-04-16T04:41:41.849694652Z","updated_at":"2026-11-02T15:49:41.509337Z"}]}}