{"id":"CVE-2011-0539","aliases":["DEBIAN-CVE-2011-0539","EUVD-2011-0557","GHSA-395x-3x8q-mv38"],"status":"published","title":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy...","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01847,"percentile":0.79216,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-264","CWE-457"],"published":"2011-02-10T17:00:00Z","modified":"2026-10-23T18:03:40Z","fixes":[{"ecosystem":"Debian:12","package":"openssh","fixed_in":["1:5.8p1-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"openssh","fixed_in":["1:5.8p1-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"openssh","fixed_in":["1:5.8p1-2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"openssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:5.8p1-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"openssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:5.8p1-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"openssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:5.8p1-2"}]}]}],"products":[{"vendor":"openbsd","product":"openssh"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2011/02/04/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://www.securitytracker.com/id?1025028","tags":["vdb-entry","x_refsource_SECTRACK","x_transferred","web"]},{"url":"http://www.securityfocus.com/bid/46155","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://kb.juniper.net/InfoCenter/index?page=content\u0026id=JSA10673","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.vupen.com/english/advisories/2011/0284","tags":["vdb-entry","x_refsource_VUPEN","x_transferred","Vendor Advisory","advisory"]},{"url":"http://secunia.com/advisories/43181","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02794777","tags":["vendor-advisory","x_refsource_HP","x_transferred","web"]},{"url":"http://secunia.com/advisories/44269","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"http://www.openssh.com/txt/legacy-cert.adv","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory","advisory","fix"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/65163","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2011-0539"},{"url":"https://github.com/advisories/GHSA-395x-3x8q-mv38"},{"url":"https://security-tracker.debian.org/tracker/CVE-2011-0539","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2011-0539","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","status":"published","published":"2011-02-10T17:00:00Z","modified":"2026-05-29T20:34:45.288Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-457"],"updated_at":"2026-11-02T14:35:39.079595Z"}],"euvd":[{"id":"EUVD-2011-0557","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","status":"published","published":"2011-02-10T17:00:00Z","modified":"2026-05-29T20:34:45Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T18:20:59.967985Z"}],"ghsa":[{"id":"GHSA-395x-3x8q-mv38","title":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy...","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","status":"published","published":"2022-05-17T02:02:08Z","modified":"2026-05-29T21:31:11Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-457"],"updated_at":"2026-11-02T15:08:24.172092Z"}],"nvd":[{"id":"CVE-2011-0539","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","status":"published","published":"2011-02-10T18:00:57.66Z","modified":"2026-06-16T23:27:35.5Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-264","CWE-457"],"updated_at":"2026-11-02T14:02:06.042049Z"}],"osv":[{"id":"DEBIAN-CVE-2011-0539","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","status":"published","published":"2011-02-10T18:00:57.66Z","modified":"2026-10-23T18:03:40.266328793Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:24.316685Z"},{"id":"CVE-2011-0539","description":"The key_certify function in usr.bin/ssh/key.c in OpenSSH 5.6 and 5.7, when generating legacy certificates using the -t command-line option in ssh-keygen, does not initialize the nonce field, which might allow remote attackers to obtain sensitive stack memory contents or make it easier to conduct hash collision attacks.","status":"published","published":"2011-02-10T18:00:57Z","modified":"2026-04-10T03:41:38.540115Z","updated_at":"2026-11-02T15:43:57.991581Z"}]}}