{"id":"CVE-2020-27743","aliases":["EUVD-2020-20247","UBUNTU-CVE-2020-27743"],"status":"published","description":"libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.","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":"2026-11-10","score":0.01736,"percentile":0.77879,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-330"],"published":"2020-10-26T21:40:19Z","modified":"2026-10-20T10:53:00Z","affected":[{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libpam-tacplus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8-2","1.3.8-2+deb8u1build0.16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libpam-tacplus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8-2","1.3.8-2+deb8u1build0.18.04.1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libpam-tacplus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8-2","1.3.8-2+deb8u1build0.20.04.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libpam-tacplus","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.8-2.1"]}],"products":[{"vendor":"pam_tacplus_project","product":"pam_tacplus"}],"references":[{"url":"https://github.com/kravietz/pam_tacplus/pull/163","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://tools.ietf.org/html/rfc8907","tags":["x_refsource_MISC","x_transferred","Technical Description","Third Party Advisory","advisory","report"]},{"url":"https://ubuntu.com/security/CVE-2020-27743","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-27743","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2020-27743","description":"libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.","status":"published","published":"2020-10-26T21:40:19Z","modified":"2024-08-04T16:18:45.595Z","updated_at":"2026-11-02T14:35:53.236501Z"}],"euvd":[{"id":"EUVD-2020-20247","description":"libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.","status":"published","published":"2020-10-26T21:40:19Z","modified":"2024-08-04T16:18:45Z","updated_at":"2026-11-03T03:07:11.950168Z"}],"nvd":[{"id":"CVE-2020-27743","description":"libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.","status":"published","published":"2020-10-26T22:15:13.203Z","modified":"2026-06-17T03:09:33.507Z","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":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"cwes":["CWE-330"],"updated_at":"2026-11-02T14:06:21.80969Z"}],"osv":[{"id":"CVE-2020-27743","description":"libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.","status":"published","published":"2020-10-26T22:15:13.203Z","modified":"2026-10-20T10:53:00.581490438Z","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"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"UBUNTU-CVE-2020-27743","description":"libtac in pam_tacplus through 1.5.1 lacks a check for a failure of RAND_bytes()/RAND_pseudo_bytes(). This could lead to use of a non-random/predictable session_id.","status":"published","published":"2020-10-26T22:15:00Z","modified":"2025-10-24T04:48:51Z","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"}],"updated_at":"2026-11-02T15:54:24.541803Z"}]}}