{"id":"CVE-2016-7406","aliases":["DEBIAN-CVE-2016-7406","DLA-634-1","EUVD-2016-8259","GHSA-jvpx-9hv9-4qf6","MGASA-2016-0301","UBUNTU-CVE-2016-7406"],"status":"published","title":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute...","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","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":"2026-11-08","score":0.10217,"percentile":0.95705,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-20"],"published":"2016-09-16T09:27:13Z","modified":"2026-09-22T07:01:34Z","fixes":[{"ecosystem":"Debian:12","package":"dropbear","fixed_in":["2016.74-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"dropbear","fixed_in":["2016.74-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"dropbear","fixed_in":["2016.74-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"dropbear","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2016.74-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"dropbear","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2016.74-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"dropbear","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2016.74-1"}]}]},{"source":"osv","ecosystem":"Debian:7","package":"dropbear","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2012.55-1.3+deb7u1"}]}],"versions":["2012.55-1.3"],"bundled":2},{"source":"osv","ecosystem":"Mageia:5","package":"dropbear","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2014.66-1.2.mga5"}]}],"bundled":3},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"dropbear","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2014.65-1ubuntu2","2015.68-1","2015.70-1","2015.71-1","2016.72-1"]}],"products":[{"vendor":"dropbear_ssh_project","product":"dropbear_ssh"}],"references":[{"url":"https://security.gentoo.org/glsa/201702-23","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Patch","Third Party Advisory","VDB Entry","fix"]},{"url":"http://www.securityfocus.com/bid/92974","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2016/09/15/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Patch","Third Party Advisory","fix","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1376353","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","report"]},{"url":"https://secure.ucc.asn.au/hg/dropbear/rev/b66a483f3dcb","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Patch","Third Party Advisory","fix","report"]},{"url":"http://seclists.org/fulldisclosure/2024/Aug/35","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-7406"},{"url":"https://github.com/advisories/GHSA-jvpx-9hv9-4qf6"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-7406","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2016-0301.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=19074","tags":["report"]},{"url":"https://secure.ucc.asn.au/hg/dropbear/rev/10f28c95ca31","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2016-7406","tags":["report"]},{"url":"http://www.openwall.com/lists/oss-security/2016/09/14/7","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-7406","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-7406","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2017-03-03T16:00:00Z","modified":"2025-11-04T16:09:09.268Z","updated_at":"2026-11-02T14:33:36.175943Z"}],"euvd":[{"id":"EUVD-2016-8259","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2017-03-03T16:00:00Z","modified":"2025-11-04T16:09:09Z","updated_at":"2026-11-02T19:49:29.391161Z"}],"ghsa":[{"id":"GHSA-jvpx-9hv9-4qf6","title":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute...","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2022-05-17T02:56:50Z","modified":"2025-11-04T18:31:37Z","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"}],"cwes":["CWE-20"],"updated_at":"2026-11-02T15:04:33.911399Z"}],"nvd":[{"id":"CVE-2016-7406","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2017-03-03T16:59:00.387Z","modified":"2026-06-17T00:53:00.3Z","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","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-20"],"updated_at":"2026-11-02T14:03:37.238712Z"}],"osv":[{"id":"CVE-2016-7406","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2017-03-03T16:59:00.387Z","modified":"2026-04-16T06:23:33.043863257Z","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":"2026-11-02T15:44:02.776224Z"},{"id":"DEBIAN-CVE-2016-7406","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2017-03-03T16:59:00.387Z","modified":"2026-09-22T07:01:34.331751505Z","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":"2026-11-02T15:45:27.910042Z"},{"id":"UBUNTU-CVE-2016-7406","description":"Format string vulnerability in Dropbear SSH before 2016.74 allows remote attackers to execute arbitrary code via format string specifiers in the (1) username or (2) host argument.","status":"published","published":"2017-03-03T16:59:00Z","modified":"2025-10-24T04:45:53Z","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":"2026-11-02T15:54:12.994319Z"},{"id":"DLA-634-1","title":"dropbear - security update","status":"published","published":"2016-09-23T00:00:00Z","modified":"2026-03-09T02:08:34.989996Z","updated_at":"2026-11-02T15:46:13.207219Z"},{"id":"MGASA-2016-0301","title":"Updated dropbear packages fix security vulnerability","description":"Message printout was vulnerable to format string injection.\n\nIf specific usernames including \"%\" symbols can be created on a system\n(validated by getpwnam()) then an attacker could run arbitrary code as\nroot when connecting to Dropbear server. Also, a dbclient user who can\ncontrol username or host arguments could potentially run arbitrary code\nas the dbclient user. This could be a problem if scripts or webpages\npass untrusted input to the dbclient program (CVE-2016-7406).\n\ndropbearconvert import of OpenSSH keys could run arbitrary code as the\nlocal dropbearconvert user when parsing malicious key files\n(CVE-2016-7607).\n\ndbclient could run arbitrary code as the local dbclient user if\nparticular -m or -c arguments are provided. This could be an issue where\ndbclient is used in scripts (CVE-2016-7408).\n","status":"published","published":"2016-09-16T09:27:13Z","modified":"2026-04-16T06:26:28.280619774Z","updated_at":"2026-11-02T15:49:40.103088Z"}]}}