{"id":"CVE-2021-38084","aliases":["DEBIAN-CVE-2021-38084","EUVD-2021-24557","GHSA-m7r5-gh9x-xg9m","UBUNTU-CVE-2021-38084"],"status":"published","title":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the...","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.01369,"percentile":0.72283,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-74"],"published":"2021-08-03T21:22:29Z","modified":"2026-10-24T10:30:18Z","fixes":[{"ecosystem":"Debian:13","package":"courier","fixed_in":["1.3.13-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"courier","fixed_in":["1.3.13-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.16-3","1.0.16-3.1","1.0.16-3.2","1.3.13-1","1.3.13-10","1.3.13-11","1.3.13-2","1.3.13-3","1.3.13-4","1.3.13-5","1.3.13-6","1.3.13-7","1.3.13-8","1.3.13-9","1.4.1-1","1.4.1-10","1.4.1-2","1.4.1-3","1.4.1-4","1.4.1-5","1.4.1-6","1.4.1-7","1.4.1-8","1.4.1-9","1.5.1-1","1.5.1-2","1.5.1-3","1.5.1-4","2.0.2-1","2.0.2-2","2.0.2-3","2.0.2-4","2.0.3-1","2.0.3-2","2.0.6-1"]},{"source":"osv","ecosystem":"Debian:13","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.13-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.13-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.68.2-1ubuntu5","0.68.2-1ubuntu6","0.68.2-1ubuntu7"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.78.0-2","0.78.0-2ubuntu1","0.78.0-2ubuntu2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.6-1build1","1.0.6-1build2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.16-3build1","1.0.16-3build2","1.0.16-3build3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.13-11","1.4.1-1","1.4.1-2","1.4.1-2build1","1.4.1-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.1-2","1.5.1-4","2.0.6-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"courier","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.1-3","1.4.1-10","1.5.1-2"]}],"products":[{"vendor":"courier-mta","product":"courier_mail_server"}],"references":[{"url":"https://sourceforge.net/p/courier/mailman/courier-imap/thread/cone.1382574216.483027.8082.1000%40monster.email-scan.com/#msg31555583","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://sourceforge.net/p/courier/mailman/message/37329216/","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38084"},{"url":"https://github.com/advisories/GHSA-m7r5-gh9x-xg9m"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-38084","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-38084","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38084","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-38084","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2021-08-03T21:22:29Z","modified":"2024-08-04T01:30:09.085Z","updated_at":"2026-11-02T14:33:07.349244Z"}],"euvd":[{"id":"EUVD-2021-24557","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2021-08-03T21:22:29Z","modified":"2024-08-04T01:30:09Z","updated_at":"2026-11-03T03:24:25.678078Z"}],"ghsa":[{"id":"GHSA-m7r5-gh9x-xg9m","title":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the...","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2022-05-24T19:10:02Z","modified":"2023-01-30T05:01:13Z","cwes":["CWE-74"],"updated_at":"2026-11-02T14:46:22.009402Z"}],"nvd":[{"id":"CVE-2021-38084","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2021-08-03T22:15:09.31Z","modified":"2026-06-17T04:01:26.043Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-74"],"updated_at":"2026-11-02T14:06:56.562207Z"}],"osv":[{"id":"CVE-2021-38084","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2021-08-03T22:15:09.31Z","modified":"2026-10-24T10:30:18.251007486Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:20.843843Z"},{"id":"DEBIAN-CVE-2021-38084","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2021-08-03T22:15:09.31Z","modified":"2026-10-23T18:05:23.133085436Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:35.521549Z"},{"id":"UBUNTU-CVE-2021-38084","description":"An issue was discovered in the POP3 component of Courier Mail Server before 1.1.5. Meddler-in-the-middle attackers can pipeline commands after the POP3 STLS command, injecting plaintext commands into an encrypted user session.","status":"published","published":"2021-08-03T22:15:00Z","modified":"2026-10-17T12:57:14.080643001Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:28.526929Z"}]}}