{"id":"CVE-2009-3639","aliases":["DEBIAN-CVE-2009-3639","DSA-1925-1","EUVD-2009-3614","GHSA-4vq9-9g4j-pgg4","openSUSE-SU-2024:10048-1"],"status":"published","title":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired...","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","severity":{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:P","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.057,"percentile":0.93066,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-310"],"published":"2009-10-28T14:00:00Z","modified":"2026-10-23T17:47:49Z","fixes":[{"ecosystem":"Debian:12","package":"proftpd-dfsg","fixed_in":["1.3.2a-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"proftpd-dfsg","fixed_in":["1.3.2a-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"proftpd-dfsg","fixed_in":["1.3.2a-2"],"sources":["osv"]},{"ecosystem":"Debian:4.0","package":"proftpd-dfsg","fixed_in":["1.3.0-19etch3"],"sources":["osv"]},{"ecosystem":"Debian:5.0","package":"proftpd-dfsg","fixed_in":["1.3.1-17lenny4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"proftpd-dfsg","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.2a-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"proftpd-dfsg","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.2a-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"proftpd-dfsg","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.2a-2"}]}]},{"source":"osv","ecosystem":"Debian:4.0","package":"proftpd-dfsg","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.0-19etch3"}]}],"versions":["1.3.0-19","1.3.0-19etch1","1.3.0-19etch2"]},{"source":"osv","ecosystem":"Debian:5.0","package":"proftpd-dfsg","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.1-17lenny4"}]}],"versions":["1.3.1-16","1.3.1-17","1.3.1-17lenny1","1.3.1-17lenny2","1.3.1-17lenny2~bpo40+1","1.3.1-17lenny3","1.3.1-17lenny4~bpo40+1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"proftpd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.5b-2.5"}]}],"bundled":8}],"products":[{"vendor":"proftpd","product":"proftpd"}],"references":[{"url":"http://marc.info/?l=oss-security\u0026m=125630966510672\u0026w=2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00649.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"http://secunia.com/advisories/37219","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","advisory"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-November/msg00642.html","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"http://www.debian.org/security/2009/dsa-1925","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","advisory"]},{"url":"http://bugs.proftpd.org/show_bug.cgi?id=3275","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://marc.info/?l=oss-security\u0026m=125632960508211\u0026w=2","tags":["mailing-list","x_refsource_MLIST","x_transferred","web"]},{"url":"http://www.securityfocus.com/bid/36804","tags":["vdb-entry","x_refsource_BID","x_transferred","Patch","fix"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/53936","tags":["vdb-entry","x_refsource_XF","x_transferred","web"]},{"url":"http://secunia.com/advisories/37131","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred","Vendor Advisory","advisory"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:288","tags":["vendor-advisory","x_refsource_MANDRIVA","x_transferred","advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=530719","tags":["x_refsource_CONFIRM","x_transferred","Patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-3639"},{"url":"https://github.com/advisories/GHSA-4vq9-9g4j-pgg4"},{"url":"https://security-tracker.debian.org/tracker/CVE-2009-3639","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2009-0542","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2009-0543","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2009-3639","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2011-1137","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2011-4130","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2013-4359","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-3306","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-3125","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2009-3639","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","status":"published","published":"2009-10-28T14:00:00Z","modified":"2024-08-07T06:38:28.465Z","updated_at":"2026-11-02T14:33:24.10565Z"}],"euvd":[{"id":"EUVD-2009-3614","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","status":"published","published":"2009-10-28T14:00:00Z","modified":"2024-08-07T06:38:28Z","updated_at":"2026-11-03T01:39:13.262818Z"}],"ghsa":[{"id":"GHSA-4vq9-9g4j-pgg4","title":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired...","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","status":"published","published":"2022-05-02T03:47:11Z","modified":"2023-01-31T05:08:49Z","updated_at":"2026-11-02T14:49:27.588283Z"}],"nvd":[{"id":"CVE-2009-3639","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","status":"published","published":"2009-10-28T14:30:00.217Z","modified":"2026-06-16T23:12:04.44Z","cvss":[{"version":"2.0","score":5.8,"vector":"AV:N/AC:M/Au:N/C:N/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-310"],"updated_at":"2026-11-02T14:01:37.004244Z"}],"osv":[{"id":"CVE-2009-3639","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","status":"published","published":"2009-10-28T14:30:00Z","modified":"2026-04-10T03:40:58.157838Z","updated_at":"2026-11-02T15:43:57.714116Z"},{"id":"DEBIAN-CVE-2009-3639","description":"The mod_tls module in ProFTPD before 1.3.2b, and 1.3.3 before 1.3.3rc2, when the dNSNameRequired TLS option is enabled, does not properly handle a '\\0' character in a domain name in the Subject Alternative Name field of an X.509 client certificate, which allows remote attackers to bypass intended client-hostname restrictions via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.","status":"published","published":"2009-10-28T14:30:00.217Z","modified":"2026-10-23T17:47:49.904286574Z","updated_at":"2026-11-02T15:45:24.013654Z"},{"id":"DSA-1925-1","title":"proftpd-dfsg - SSL certificate verification weakness","status":"published","published":"2009-10-31T00:00:00Z","modified":"2026-03-09T01:19:11.787912Z","updated_at":"2026-11-02T15:46:14.734124Z"},{"id":"openSUSE-SU-2024:10048-1","title":"proftpd-1.3.5b-2.5 on GA media","description":"These are all security issues fixed in the proftpd-1.3.5b-2.5 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T02:26:45.618538Z","updated_at":"2026-11-02T16:58:33.135986Z"}]}}