{"id":"CVE-2020-11931","aliases":["EUVD-2020-4268","GHSA-m777-7jfr-8wgh","UBUNTU-CVE-2020-11931","USN-4355-1"],"status":"published","title":"Ubuntu modifications to pulseaudio to provide snap security enforcement could be unloaded","description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","severity":{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.0033,"percentile":0.26546,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-284","CWE-668"],"published":"2020-04-16T00:00:00Z","modified":"2026-06-17T02:51:04Z","fixes":[{"ecosystem":"Ubuntu:16.04:LTS","package":"pulseaudio","fixed_in":["1:8.0-0ubuntu3.12"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"pulseaudio","fixed_in":["1:11.1-1ubuntu7.7"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"pulseaudio","fixed_in":["1:13.99.1-1ubuntu3.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"pulseaudio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.0-0ubuntu3.12"}]}],"versions":["1:6.0-0ubuntu13","1:7.1-1ubuntu1","1:7.1-1ubuntu2","1:7.1-1ubuntu3","1:7.1-1ubuntu6","1:7.1-1ubuntu7","1:8.0-0ubuntu2","1:8.0-0ubuntu3","1:8.0-0ubuntu3.1","1:8.0-0ubuntu3.2","1:8.0-0ubuntu3.3","1:8.0-0ubuntu3.4","1:8.0-0ubuntu3.7","1:8.0-0ubuntu3.8","1:8.0-0ubuntu3.9","1:8.0-0ubuntu3.10","1:8.0-0ubuntu3.11"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"pulseaudio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:11.1-1ubuntu7.7"}]}],"versions":["1:10.0-2ubuntu3","1:11.1-1ubuntu1","1:11.1-1ubuntu2","1:11.1-1ubuntu4","1:11.1-1ubuntu5","1:11.1-1ubuntu6","1:11.1-1ubuntu7","1:11.1-1ubuntu7.1","1:11.1-1ubuntu7.2","1:11.1-1ubuntu7.4","1:11.1-1ubuntu7.5"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"pulseaudio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:13.99.1-1ubuntu3.2"}]}],"versions":["1:13.0-1ubuntu1","1:13.0-1ubuntu4","1:13.0-1ubuntu5","1:13.0-3ubuntu1","1:13.0-3ubuntu2","1:13.99.1-1ubuntu1","1:13.99.1-1ubuntu2","1:13.99.1-1ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"pulseaudio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:8.0-0ubuntu3.12"}]}],"versions":["1:6.0-0ubuntu13","1:7.1-1ubuntu1","1:7.1-1ubuntu2","1:7.1-1ubuntu3","1:7.1-1ubuntu6","1:7.1-1ubuntu7","1:8.0-0ubuntu2","1:8.0-0ubuntu3","1:8.0-0ubuntu3.1","1:8.0-0ubuntu3.2","1:8.0-0ubuntu3.3","1:8.0-0ubuntu3.4","1:8.0-0ubuntu3.7","1:8.0-0ubuntu3.8","1:8.0-0ubuntu3.9","1:8.0-0ubuntu3.10","1:8.0-0ubuntu3.11"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"pulseaudio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:11.1-1ubuntu7.7"}]}],"versions":["1:10.0-2ubuntu3","1:11.1-1ubuntu1","1:11.1-1ubuntu2","1:11.1-1ubuntu4","1:11.1-1ubuntu5","1:11.1-1ubuntu6","1:11.1-1ubuntu7","1:11.1-1ubuntu7.1","1:11.1-1ubuntu7.2","1:11.1-1ubuntu7.4","1:11.1-1ubuntu7.5"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"pulseaudio","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:13.99.1-1ubuntu3.2"}]}],"versions":["1:13.0-1ubuntu1","1:13.0-1ubuntu4","1:13.0-1ubuntu5","1:13.0-3ubuntu1","1:13.0-3ubuntu2","1:13.99.1-1ubuntu1","1:13.99.1-1ubuntu2","1:13.99.1-1ubuntu3"]}],"products":[{"vendor":"canonical","product":"pulseaudio"},{"vendor":"canonical","product":"ubuntu_linux"},{"vendor":"pulseaudio","product":"pulseaudio"}],"references":[{"url":"https://forum.snapcraft.io/t/audio-switcher-pulseaudio-interface-auto-connect-request/16648/3","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","report"]},{"url":"https://usn.ubuntu.com/4355-1/","tags":["vendor-advisory","x_refsource_UBUNTU","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-11931"},{"url":"https://github.com/advisories/GHSA-m777-7jfr-8wgh"},{"url":"https://ubuntu.com/security/CVE-2020-11931","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4355-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-11931","tags":["report"]},{"url":"https://launchpad.net/bugs/1877102","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-11931","title":"Ubuntu modifications to pulseaudio to provide snap security enforcement could be unloaded","description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","status":"published","published":"2020-05-15T03:25:11.587Z","modified":"2024-09-17T00:41:25.129Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:35:57.67317Z"}],"euvd":[{"id":"EUVD-2020-4268","description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","status":"published","published":"2020-05-15T03:25:11Z","modified":"2024-09-17T00:41:25Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-03T00:28:56.965297Z"}],"ghsa":[{"id":"GHSA-m777-7jfr-8wgh","title":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged...","description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","status":"published","published":"2022-05-24T17:17:58Z","modified":"2023-01-29T05:02:41Z","updated_at":"2026-11-02T14:45:09.006349Z"}],"nvd":[{"id":"CVE-2020-11931","description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","status":"published","published":"2020-05-15T04:15:10.737Z","modified":"2026-06-17T02:51:04.79Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-284","CWE-668"],"updated_at":"2026-11-02T14:06:00.784809Z"}],"osv":[{"id":"UBUNTU-CVE-2020-11931","description":"An Ubuntu-specific modification to Pulseaudio to provide security mediation for Snap-packaged applications was found to have a bypass of intended access restriction for snaps which plugs any of pulseaudio, audio-playback or audio-record via unloading the pulseaudio snap policy module. This issue affects: pulseaudio 1:8.0 versions prior to 1:8.0-0ubuntu3.12; 1:11.1 versions prior to 1:11.1-1ubuntu7.7; 1:13.0 versions prior to 1:13.0-1ubuntu1.2; 1:13.99.1 versions prior to 1:13.99.1-1ubuntu3.2;","status":"published","published":"2020-04-16T00:00:00Z","modified":"2026-04-22T12:27:26.919872Z","cvss":[{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"},{"version":"3.1","score":3.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T15:54:22.212782Z"},{"id":"USN-4355-1","title":"pulseaudio vulnerability","description":"PulseAudio in Ubuntu contains additional functionality to mediate audio\nrecording for snap packages and it was discovered that this functionality\ndid not mediate PulseAudio module unloading. An attacker-controlled snap\nwith only the audio-playback interface connected could exploit this to\nbypass access controls and record audio.\n","status":"published","published":"2020-05-12T19:25:07Z","modified":"2026-04-22T10:04:53.273165Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}