{"id":"CVE-2007-2243","aliases":["DEBIAN-CVE-2007-2243","EUVD-2007-2238","GHSA-p5mx-m79g-73hx"],"status":"published","title":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers...","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","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":0.02405,"percentile":0.84172,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-287"],"published":"2007-04-25T16:00:00Z","modified":"2026-10-21T17:47:48Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"openssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:10.0p1-1","1:10.0p1-2","1:10.0p1-3","1:10.0p1-4","1:10.0p1-5","1:10.0p1-5~bpo12+2","1:10.0p1-6","1:10.0p1-7","1:10.0p1-7~bpo12+1","1:10.0p1-8","1:10.1p1-1","1:10.1p1-2","1:10.2p1-1","1:10.2p1-2","1:10.2p1-2~bpo13+1","1:10.2p1-3","1:10.2p1-4","1:10.2p1-5","1:10.2p1-6","1:10.2p1-6~bpo13+1","1:10.3p1-1","1:10.3p1-1~bpo13+1","1:10.3p1-2","1:10.3p1-3","1:10.3p1-4","1:10.3p1-5","1:10.3p1-7","1:10.3p1-8","1:10.3p1-9","1:10.4p1-1","1:10.4p1-2","1:10.4p1-3","1:10.4p1-4","1:10.4p1-5","1:10.5p1-1","1:10.6p1-1","1:9.2p1-2","1:9.2p1-2+deb12u1","1:9.2p1-2+deb12u10","1:9.2p1-2+deb12u2","1:9.2p1-2+deb12u3","1:9.2p1-2+deb12u4","1:9.2p1-2+deb12u5","1:9.2p1-2+deb12u6","1:9.2p1-2+deb12u7","1:9.2p1-2+deb12u8","1:9.2p1-2+deb12u9","1:9.3p1-1","1:9.3p1-1+loong64","1:9.3p2-1","1:9.4p1-1","1:9.5p1-1","1:9.5p1-2","1:9.6p1-1","1:9.6p1-2","1:9.6p1-3","1:9.6p1-4","1:9.6p1-5","1:9.7p1-1","1:9.7p1-2","1:9.7p1-3","1:9.7p1-3+hurd.1","1:9.7p1-4","1:9.7p1-5","1:9.7p1-6","1:9.7p1-7","1:9.8p1-1","1:9.8p1-2","1:9.8p1-3","1:9.8p1-4","1:9.8p1-7","1:9.8p1-8","1:9.9p1-1","1:9.9p1-2","1:9.9p1-3","1:9.9p1-3+hurd.1","1:9.9p2-1","1:9.9p2-2"]},{"source":"osv","ecosystem":"Debian:13","package":"openssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:10.0p1-7","1:10.0p1-7+deb13u1","1:10.0p1-7+deb13u2","1:10.0p1-7+deb13u3","1:10.0p1-7+deb13u4","1:10.0p1-8","1:10.1p1-1","1:10.1p1-2","1:10.2p1-1","1:10.2p1-2","1:10.2p1-2~bpo13+1","1:10.2p1-3","1:10.2p1-4","1:10.2p1-5","1:10.2p1-6","1:10.2p1-6~bpo13+1","1:10.3p1-1","1:10.3p1-1~bpo13+1","1:10.3p1-2","1:10.3p1-3","1:10.3p1-4","1:10.3p1-5","1:10.3p1-7","1:10.3p1-8","1:10.3p1-9","1:10.4p1-1","1:10.4p1-2","1:10.4p1-3","1:10.4p1-4","1:10.4p1-5","1:10.5p1-1","1:10.6p1-1"]},{"source":"osv","ecosystem":"Debian:14","package":"openssh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:10.0p1-7","1:10.0p1-8","1:10.1p1-1","1:10.1p1-2","1:10.2p1-1","1:10.2p1-2","1:10.2p1-2~bpo13+1","1:10.2p1-3","1:10.2p1-4","1:10.2p1-5","1:10.2p1-6","1:10.2p1-6~bpo13+1","1:10.3p1-1","1:10.3p1-1~bpo13+1","1:10.3p1-2","1:10.3p1-3","1:10.3p1-4","1:10.3p1-5","1:10.3p1-7","1:10.3p1-8","1:10.3p1-9","1:10.4p1-1","1:10.4p1-2","1:10.4p1-3","1:10.4p1-4","1:10.4p1-5","1:10.5p1-1","1:10.6p1-1"]}],"products":[{"vendor":"openbsd","product":"openssh"}],"references":[{"url":"http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053906.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","web"]},{"url":"http://www.securityfocus.com/bid/23601","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://securityreason.com/securityalert/2631","tags":["third-party-advisory","x_refsource_SREASON","x_transferred","web"]},{"url":"http://www.osvdb.org/34600","tags":["vdb-entry","x_refsource_OSVDB","x_transferred","web"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/33794","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://lists.grok.org.uk/pipermail/full-disclosure/2007-April/053951.html","tags":["mailing-list","x_refsource_FULLDISC","x_transferred","web"]},{"url":"https://security.netapp.com/advisory/ntap-20191107-0003/","tags":["x_refsource_CONFIRM","x_transferred","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2007-2243"},{"url":"https://security.netapp.com/advisory/ntap-20191107-0003"},{"url":"https://github.com/advisories/GHSA-p5mx-m79g-73hx"},{"url":"https://security-tracker.debian.org/tracker/CVE-2007-2243","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2007-2243","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","status":"published","published":"2007-04-25T16:00:00Z","modified":"2024-08-07T13:33:27.475Z","updated_at":"2026-11-02T13:32:34.372976Z"}],"euvd":[{"id":"EUVD-2007-2238","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","status":"published","published":"2007-04-25T16:00:00Z","modified":"2024-08-07T13:33:27Z","updated_at":"2026-11-03T01:38:21.874689Z"}],"ghsa":[{"id":"GHSA-p5mx-m79g-73hx","title":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers...","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","status":"published","published":"2022-05-01T18:01:38Z","modified":"2025-04-09T03:41:41Z","cwes":["CWE-287"],"updated_at":"2026-11-02T15:00:53.859901Z"}],"nvd":[{"id":"CVE-2007-2243","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","status":"published","published":"2007-04-25T16:19:00Z","modified":"2026-06-16T22:39:12.64Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-287"],"updated_at":"2026-11-02T14:01:15.696607Z"}],"osv":[{"id":"CVE-2007-2243","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","status":"published","published":"2007-04-25T16:19:00Z","modified":"2026-04-10T03:38:49.337885Z","updated_at":"2026-11-02T15:43:56.865964Z"},{"id":"DEBIAN-CVE-2007-2243","description":"OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.","status":"published","published":"2007-04-25T16:19:00Z","modified":"2026-10-21T17:47:48.528880226Z","updated_at":"2026-11-02T15:45:23.411908Z"}]}}