{"id":"CVE-2016-4422","aliases":["DEBIAN-CVE-2016-4422","DSA-3567-1","EUVD-2016-5422","GHSA-c337-rr2j-g4h6","UBUNTU-CVE-2016-4422"],"status":"published","title":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent...","description":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.","severity":{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01803,"percentile":0.78662,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2016-05-04T00:00:00Z","modified":"2026-06-17T00:47:31Z","fixes":[{"ecosystem":"Debian:8","package":"libpam-sshauth","fixed_in":["0.3.1-1+deb8u1"],"sources":["osv"]},{"ecosystem":"Ubuntu:14.04:LTS","package":"libpam-sshauth","fixed_in":["0.3.1-1deb8u1build0.14.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"libpam-sshauth","fixed_in":["0.3.1-1ubuntu2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:8","package":"libpam-sshauth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.1-1+deb8u1"}]}],"versions":["0.3.1-1"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"libpam-sshauth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.1-1deb8u1build0.14.04.1"}]}],"versions":["0.3.1-1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libpam-sshauth","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.3.1-1ubuntu2"}]}],"versions":["0.3.1-1","0.3.1-1ubuntu1"]}],"products":[{"vendor":"debian","product":"debian_linux"},{"vendor":"libpam-sshauth_project","product":"libpam-sshauth"}],"references":[{"url":"http://www.debian.org/security/2016/dsa-3567","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","Third Party Advisory"]},{"url":"https://bazaar.launchpad.net/~ltsp-upstream/ltsp/libpam-sshauth/revision/114#src/pam_sshauth.c","tags":["x_refsource_CONFIRM","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-4422"},{"url":"https://github.com/advisories/GHSA-c337-rr2j-g4h6"},{"url":"https://ubuntu.com/security/CVE-2016-4422","tags":["report"]},{"url":"http://www.openwall.com/lists/oss-security/2016/05/01/2","tags":["report"]},{"url":"https://bazaar.launchpad.net/~ltsp-upstream/ltsp/libpam-sshauth/revision/93/src/pam_sshauth.c","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-4422","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-4422","description":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.","status":"published","published":"2016-05-06T17:00:00Z","modified":"2024-08-06T00:32:24.66Z","updated_at":"2026-11-02T14:33:35.149563Z"}],"euvd":[{"id":"EUVD-2016-5422","description":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.","status":"published","published":"2016-05-06T17:00:00Z","modified":"2024-08-06T00:32:24Z","updated_at":"2026-11-03T02:22:46.329763Z"}],"ghsa":[{"id":"GHSA-c337-rr2j-g4h6","title":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent...","description":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.","status":"published","published":"2022-05-13T01:11:15Z","modified":"2023-02-01T05:03:40Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:50:05.685198Z"}],"nvd":[{"id":"CVE-2016-4422","description":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.","status":"published","published":"2016-05-06T17:59:08.85Z","modified":"2026-06-17T00:47:31.603Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":10,"vector":"AV:N/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:03:25.366449Z"}],"osv":[{"id":"UBUNTU-CVE-2016-4422","description":"The pam_sm_authenticate function in pam_sshauth.c in libpam-sshauth might allow context-dependent attackers to bypass authentication or gain privileges via a system user account.","status":"published","published":"2016-05-06T17:59:00Z","modified":"2025-09-08T16:43:44Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"},{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:12.261906Z"},{"id":"DSA-3567-1","title":"libpam-sshauth - security update","status":"published","published":"2016-05-04T00:00:00Z","modified":"2026-03-09T01:21:52.02222Z","updated_at":"2026-11-02T15:46:16.199525Z"}]}}