{"id":"CVE-2020-27638","aliases":["DEBIAN-CVE-2020-27638","DLA-2414-1","EUVD-2020-20145","GHSA-5qg6-2968-fxg3","UBUNTU-CVE-2020-27638","USN-4610-1","USN-4718-1"],"status":"published","title":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets...","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.02362,"percentile":0.8392,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-119","CWE-617"],"published":"2020-10-22T12:27:04Z","modified":"2026-10-26T12:02:31Z","fixes":[{"ecosystem":"Debian:12","package":"fastd","fixed_in":["21-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"fastd","fixed_in":["21-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"fastd","fixed_in":["21-1"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"fastd","fixed_in":["18-2+deb9u1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"fastd","fixed_in":["17-4ubuntu0.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"fastd","fixed_in":["18-3ubuntu0.18.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"fastd","fixed_in":["18-3ubuntu0.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"21-1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18-2+deb9u1"}]}],"versions":["18-2"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17-4ubuntu0.1"}]}],"versions":["17-4","17-4build1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18-3ubuntu0.18.04.1"}]}],"versions":["18-2","18-2ubuntu1","18-2ubuntu2","18-3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18-3ubuntu0.1"}]}],"versions":["18-3build1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18-3ubuntu0.1"}]}],"versions":["18-3build1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"17-4ubuntu0.1"}]}],"versions":["17-4","17-4build1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"fastd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"18-3ubuntu0.18.04.1"}]}],"versions":["18-2","18-2ubuntu1","18-2ubuntu2","18-3"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"fastd_project","product":"fastd"},{"vendor":"fedoraproject","product":"fedora"}],"references":[{"url":"https://fastd.readthedocs.io/en/stable/releases/v21.html","tags":["x_refsource_MISC","x_transferred","Broken Link","Release Notes","Third Party Advisory","advisory","report"]},{"url":"https://github.com/NeoRaider/fastd/commit/737925113363b6130879729cdff9ccc46c33eaea","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","report"]},{"url":"https://bugs.debian.org/972521","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://lists.debian.org/debian-lts-announce/2020/10/msg00025.html","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Third Party Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUZ3AGTAXH7OOP45F5WXBVRQ3IDWUR7M/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSMH65GHKHMJAK2VMPROIPIUS4IA63CW/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D2LNSF2LI4RQ7BVGHTJQUJWP7RVGHDTK/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27638"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D2LNSF2LI4RQ7BVGHTJQUJWP7RVGHDTK/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GUZ3AGTAXH7OOP45F5WXBVRQ3IDWUR7M/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSMH65GHKHMJAK2VMPROIPIUS4IA63CW/"},{"url":"https://github.com/advisories/GHSA-5qg6-2968-fxg3"},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-27638","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-27638","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4610-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-4718-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-27638","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-27638","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2020-10-22T12:27:04Z","modified":"2024-08-04T16:18:45.492Z","updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-20145","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2020-10-22T12:27:04Z","modified":"2024-08-04T16:18:45Z","updated_at":"2026-11-03T03:07:12.435876Z"}],"ghsa":[{"id":"GHSA-5qg6-2968-fxg3","title":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets...","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2022-05-24T17:31:59Z","modified":"2023-01-29T05:05:04Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119","CWE-617"],"updated_at":"2026-11-02T14:45:42.123832Z"}],"nvd":[{"id":"CVE-2020-27638","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2020-10-22T13:15:15.613Z","modified":"2026-06-17T03:09:24.89Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:06:20.704992Z"}],"osv":[{"id":"CVE-2020-27638","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2020-10-22T13:15:15.613Z","modified":"2026-10-20T13:59:23.870464575Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"DEBIAN-CVE-2020-27638","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2020-10-22T13:15:15.613Z","modified":"2026-10-26T12:02:31.152756146Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:33.729655Z"},{"id":"UBUNTU-CVE-2020-27638","description":"receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.","status":"published","published":"2020-10-22T13:15:00Z","modified":"2026-02-04T04:19:58.956001Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:24.541803Z"},{"id":"DLA-2414-1","title":"fastd - security update","status":"published","published":"2020-10-25T00:00:00Z","modified":"2026-03-09T01:19:46.843397Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"USN-4610-1","title":"fastd vulnerability","description":"It was discovered that fastd did not properly handle receive buffers under\ncertain circumstances. A remote attacker could possibly use this issue to\ncause a memory leak, resulting in a denial of service. (CVE-2020-27638)\n","status":"published","published":"2020-10-29T13:20:40Z","modified":"2026-02-10T04:41:58Z","updated_at":"2026-11-02T16:58:15.159055Z"},{"id":"USN-4718-1","title":"fastd vulnerability","description":"It was discovered that fastd incorrectly handled certain packets.\nAn attacker could possibly use this issue to cause a denial of service.\n","status":"published","published":"2021-02-02T14:09:32Z","modified":"2026-02-10T04:42:02Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}