{"id":"CVE-2018-7749","aliases":["DEBIAN-CVE-2018-7749","EUVD-2018-0022","GHSA-97cv-6pjf-5f9q","PYSEC-2018-108","UBUNTU-CVE-2018-7749","USN-4854-1"],"status":"published","title":"AsyncSSH SSH Server Authentication Bypass","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","severity":{"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","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01783,"percentile":0.78416,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-287"],"published":"2018-03-12T19:00:00Z","modified":"2026-10-23T18:03:08Z","fixes":[{"ecosystem":"PyPI","package":"asyncssh","fixed_in":["1.12.1"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"python-asyncssh","fixed_in":["1.12.1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"python-asyncssh","fixed_in":["1.12.1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"python-asyncssh","fixed_in":["1.12.1-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"python-asyncssh","fixed_in":["1.11.1-1ubuntu0.1~esm1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"python-asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"python-asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"python-asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1-1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1"}]}],"versions":["0.8.1","0.8.2","0.8.3","0.8.4","0.9.0","0.9.1","0.9.2","1.0.0","1.0.1","1.1.0","1.1.1","1.10.0","1.10.1","1.11.0","1.11.1","1.12.0","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.4.0","1.4.1","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.6.0","1.6.1","1.6.2","1.7.1","1.7.2","1.7.3","1.8.0","1.8.1","1.9.0"]},{"source":"osv","ecosystem":"PyPI","package":"asyncssh","ranges":[{"type":"GIT","events":[{"introduced":"0"},{"fixed":"c161e26cdc0d41b745b63d9f17b437f073bf7ba4"}]},{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1"}]}],"versions":["0.8.1","0.8.2","0.8.3","0.8.4","0.9.0","0.9.1","0.9.2","1.0.0","1.0.1","1.1.0","1.1.1","1.10.0","1.10.1","1.11.0","1.11.1","1.12.0","1.2.0","1.2.1","1.3.0","1.3.1","1.3.2","1.4.0","1.4.1","1.5.0","1.5.1","1.5.2","1.5.3","1.5.4","1.5.5","1.5.6","1.6.0","1.6.1","1.6.2","1.7.1","1.7.2","1.7.3","1.8.0","1.8.1","1.9.0","v1.12.0","v1.11.1","v1.11.0","v1.10.1","v1.10.0","v1.9.0","v1.8.1","v1.8.0","v1.7.3","v1.7.2","v1.7.1","v1.6.2","v1.6.1","v1.6.0","v1.5.6","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.1","v1.4.0","v1.3.2","v1.3.1","v1.3.0","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.1","v1.0.0","v0.9.2","v0.9.1","v0.9.0","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8.0","v0.7.0","v0.6.0","v0.5.0","v0.4.0","v0.3.0","v0.2.0","v0.1.0"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"python-asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.0-1","1.2.1-1","1.3.0-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"python-asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-1ubuntu0.1~esm1"}]}],"versions":["1.8.1-2","1.11.0-2","1.11.1-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"python-asyncssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.1-1ubuntu0.1~esm1"}]}],"versions":["1.8.1-2","1.11.0-2","1.11.1-1"]}],"products":[{"vendor":"asyncssh_project","product":"asyncssh"}],"references":[{"url":"https://groups.google.com/forum/#%21msg/asyncssh-announce/57_5O7kiHSA/8BXZ_hxHAQAJ","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://github.com/ronf/asyncssh/commit/c161e26cdc0d41b745b63d9f17b437f073bf7ba4","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory","advisory","web","fix","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-7749","tags":["advisory"]},{"url":"https://groups.google.com/forum/#!msg/asyncssh-announce/57_5O7kiHSA/8BXZ_hxHAQAJ","tags":["web"]},{"url":"https://github.com/ronf/asyncssh/commit/16e6ebfa893167c7d9d3f6dc7a2c0d197e47f43a","tags":["web","report"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/asyncssh/PYSEC-2018-108.yaml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-97cv-6pjf-5f9q","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2018-7749","tags":["advisory"]},{"url":"https://github.com/ronf/asyncssh","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2018-7749","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-4854-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2018-7749","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2018-7749","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2018-03-12T19:00:00Z","modified":"2024-08-05T06:37:59.134Z","updated_at":"2026-11-02T14:35:10.313768Z"}],"euvd":[{"id":"EUVD-2018-0022","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2018-03-12T19:00:00Z","modified":"2024-08-05T06:37:59Z","updated_at":"2026-11-03T02:40:05.186892Z"}],"ghsa":[{"id":"GHSA-97cv-6pjf-5f9q","title":"AsyncSSH SSH Server Authentication Bypass","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2022-05-14T01:29:12Z","modified":"2024-09-04T20:55:09Z","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":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:38:01.080229Z"}],"nvd":[{"id":"CVE-2018-7749","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. 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A customized SSH client can simply skip the authentication step.","status":"published","published":"2018-03-12T19:29:00.207Z","modified":"2026-10-20T10:50:30.981729301Z","cvss":[{"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":"2026-11-02T15:44:09.74357Z"},{"id":"DEBIAN-CVE-2018-7749","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2018-03-12T19:29:00.207Z","modified":"2026-10-23T18:03:08.961550276Z","cvss":[{"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":"2026-11-02T15:45:31.170944Z"},{"id":"GHSA-97cv-6pjf-5f9q","title":"AsyncSSH SSH Server Authentication Bypass","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2022-05-14T01:29:12Z","modified":"2025-02-16T05:28:33.468247Z","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":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T15:46:43.524801Z"},{"id":"UBUNTU-CVE-2018-7749","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2018-03-12T19:29:00Z","modified":"2026-02-04T03:47:04.57219Z","cvss":[{"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":"2026-11-02T15:54:18.772093Z"},{"id":"PYSEC-2018-108","description":"The SSH server implementation of AsyncSSH before 1.12.1 does not properly check whether authentication is completed before processing other requests. A customized SSH client can simply skip the authentication step.","status":"published","published":"2018-03-12T19:29:00Z","modified":"2026-06-10T17:00:10.905276221Z","updated_at":"2026-11-02T15:52:51.645172Z"},{"id":"USN-4854-1","title":"python-asyncssh vulnerability","description":"Matthijs Kooijman discovered that AsyncSSH server did not properly handle\nauthentication under certain conditions. An attacker with a specially\ncrafted client could use this vulnerability to skip authentication of SSH\nsessions.","status":"published","published":"2021-03-15T22:40:45Z","modified":"2026-02-10T04:42:06Z","updated_at":"2026-11-02T16:58:15.159055Z"}]}}