{"id":"CVE-2006-6301","aliases":["EUVD-2006-6284","GHSA-6xhr-5mv6-f4jf"],"status":"published","title":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add...","description":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.","severity":{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.0189,"percentile":0.79691,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2006-12-06T19:00:00Z","modified":"2026-06-16T22:32:52Z","products":[{"vendor":"denyhosts","product":"denyhosts"}],"references":[{"url":"http://bugs.gentoo.org/show_bug.cgi?id=157163","tags":["x_refsource_CONFIRM","x_transferred","Exploit"]},{"url":"http://www.vupen.com/english/advisories/2006/4876","tags":["vdb-entry","x_refsource_VUPEN","x_transferred"]},{"url":"http://secunia.com/advisories/23236","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/30761","tags":["vdb-entry","x_refsource_XF","x_transferred"]},{"url":"http://www.securityfocus.com/bid/21468","tags":["vdb-entry","x_refsource_BID","x_transferred"]},{"url":"http://secunia.com/advisories/23603","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory"]},{"url":"http://security.gentoo.org/glsa/glsa-200701-01.xml","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2006-6301"},{"url":"https://github.com/advisories/GHSA-6xhr-5mv6-f4jf"}],"sources":{"cve":[{"id":"CVE-2006-6301","description":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.","status":"published","published":"2006-12-06T19:00:00Z","modified":"2024-08-07T20:19:35.199Z","updated_at":"2026-11-02T14:33:50.374603Z"}],"euvd":[{"id":"EUVD-2006-6284","description":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.","status":"published","published":"2006-12-06T19:00:00Z","modified":"2024-08-07T20:19:35Z","updated_at":"2026-11-03T01:15:43.868899Z"}],"ghsa":[{"id":"GHSA-6xhr-5mv6-f4jf","title":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add...","description":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.","status":"published","published":"2022-05-01T07:36:50Z","modified":"2023-01-31T05:02:51Z","updated_at":"2026-11-02T14:48:20.805498Z"}],"nvd":[{"id":"CVE-2006-6301","description":"DenyHosts 2.5 does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a login name containing certain strings with an IP address, which is not properly handled by a regular expression.","status":"published","published":"2006-12-06T19:28:00Z","modified":"2026-06-16T22:32:52.647Z","cvss":[{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:01:09.852738Z"}]}}