{"id":"CVE-2009-0580","published":"2009-06-05T15:25:00Z","modified":"2024-08-07T04:40:04Z","title":"Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when FORM authentication is used…","vendor":null,"product":null,"tier":"core","eol":null,"description":{"text":"Apache Tomcat 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18, when FORM authentication is used, allows remote attackers to enumerate valid usernames via requests to /j_security_check with malformed URL encoding of passwords, related to improper error checking in the (1) MemoryRealm, (2) DataSourceRealm, and (3) JDBCRealm authentication realms, as demonstrated by a % (percent) value for the j_password parameter.","provenance":"source","from":"CVE.org"},"summary":{"text":"Apache Tomcat versions 4.1.0 through 4.1.39, 5.5.0 through 5.5.27, and 6.0.0 through 6.0.18 contain improper error checking in the MemoryRealm, DataSourceRealm, and JDBCRealm authentication realms when FORM authentication is used. A remote attacker who can send requests to /j_security_check can enumerate valid usernames by submitting malformed URL encoding in the j_password parameter, such as a lone % character, without needing prior authentication.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:18:11Z"},"cvss":null,"epss":{"score":0.9444,"percentile":0.99851,"date":"2026-10-28","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":0,"pulses":[],"provenance":"machine"},"cwes":[],"references":[{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9101","tags":["vdb-entry","signature","x_refsource_OVAL"]},{"url":"http://tomcat.apache.org/security-4.html","tags":["x_refsource_CONFIRM"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18915","tags":["vdb-entry","signature","x_refsource_OVAL"]},{"url":"http://marc.info/?l=bugtraq&m=127420533226623&w=2","tags":["vendor-advisory","x_refsource_HP"]},{"url":"http://secunia.com/advisories/35326","tags":["third-party-advisory","x_refsource_SECUNIA"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:138","tags":["vendor-advisory","x_refsource_MANDRIVA"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01246.html","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"http://www.debian.org/security/2011/dsa-2207","tags":["vendor-advisory","x_refsource_DEBIAN"]},{"url":"http://www.securityfocus.com/bid/35196","tags":["vdb-entry","x_refsource_BID"]},{"url":"http://secunia.com/advisories/35344","tags":["third-party-advisory","x_refsource_SECUNIA"]},{"url":"http://marc.info/?l=bugtraq&m=136485229118404&w=2","tags":["vendor-advisory","x_refsource_HP"]},{"url":"http://secunia.com/advisories/37460","tags":["third-party-advisory","x_refsource_SECUNIA"]},{"url":"http://www.vupen.com/english/advisories/2010/3056","tags":["vdb-entry","x_refsource_VUPEN"]},{"url":"http://www.vmware.com/security/advisories/VMSA-2009-0016.html","tags":["x_refsource_CONFIRM"]},{"url":"http://secunia.com/advisories/35788","tags":["third-party-advisory","x_refsource_SECUNIA"]},{"url":"http://www.securityfocus.com/archive/1/504125/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ"]},{"url":"http://svn.apache.org/viewvc?rev=747840&view=rev","tags":["x_refsource_CONFIRM"]},{"url":"http://www.securityfocus.com/archive/1/504045/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ"]},{"url":"http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html","tags":["vendor-advisory","x_refsource_APPLE"]},{"url":"http://www.vupen.com/english/advisories/2009/1496","tags":["vdb-entry","x_refsource_VUPEN"]},{"url":"http://marc.info/?l=bugtraq&m=133469267822771&w=2","tags":["vendor-advisory","x_refsource_HP"]},{"url":"http://www.securityfocus.com/archive/1/504108/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ"]},{"url":"http://svn.apache.org/viewvc?rev=781382&view=rev","tags":["x_refsource_CONFIRM"]},{"url":"https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6628","tags":["vdb-entry","signature","x_refsource_OVAL"]},{"url":"http://www.vupen.com/english/advisories/2009/1856","tags":["vdb-entry","x_refsource_VUPEN"]},{"url":"http://securitytracker.com/id?1022332","tags":["vdb-entry","x_refsource_SECTRACK"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2010:176","tags":["vendor-advisory","x_refsource_MANDRIVA"]},{"url":"http://www.securityfocus.com/archive/1/507985/100/0/threaded","tags":["mailing-list","x_refsource_BUGTRAQ"]},{"url":"http://secunia.com/advisories/42368","tags":["third-party-advisory","x_refsource_SECUNIA"]},{"url":"http://tomcat.apache.org/security-6.html","tags":["x_refsource_CONFIRM"]},{"url":"http://support.apple.com/kb/HT4077","tags":["x_refsource_CONFIRM"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01156.html","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"http://secunia.com/advisories/35685","tags":["third-party-advisory","x_refsource_SECUNIA"]},{"url":"https://www.redhat.com/archives/fedora-package-announce/2009-November/msg01216.html","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"http://tomcat.apache.org/security-5.html","tags":["x_refsource_CONFIRM"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2009-07/msg00002.html","tags":["vendor-advisory","x_refsource_SUSE"]},{"url":"http://marc.info/?l=bugtraq&m=129070310906557&w=2","tags":["vendor-advisory","x_refsource_HP"]},{"url":"https://exchange.xforce.ibmcloud.com/vulnerabilities/50930","tags":["vdb-entry","x_refsource_XF"]},{"url":"http://svn.apache.org/viewvc?rev=781379&view=rev","tags":["x_refsource_CONFIRM"]},{"url":"http://www.mandriva.com/security/advisories?name=MDVSA-2009:136","tags":["vendor-advisory","x_refsource_MANDRIVA"]},{"url":"http://sunsolve.sun.com/search/document.do?assetkey=1-26-263529-1","tags":["vendor-advisory","x_refsource_SUNALERT"]},{"url":"http://www.vupen.com/english/advisories/2009/3316","tags":["vdb-entry","x_refsource_VUPEN"]},{"url":"https://lists.apache.org/thread.html/29dc6c2b625789e70a9c4756b5a327e6547273ff8bde7e0327af48c5%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/06cfb634bc7bf37af7d8f760f118018746ad8efbd519c4b789ac9c2e%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/c62b0e3a7bf23342352a5810c640a94b6db69957c5c19db507004d74%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/8dcaf7c3894d66cb717646ea1504ea6e300021c85bb4e677dc16b1aa%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/r584a714f141eff7b1c358d4679288177bd4ca4558e9999d15867d4b5%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/rb71997f506c6cc8b530dd845c084995a9878098846c7b4eacfae8db3%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]},{"url":"https://lists.apache.org/thread.html/r3aacc40356defc3f248aa504b1e48e819dd0471a0a83349080c6bcbf%40%3Cdev.tomcat.apache.org%3E","tags":["mailing-list","x_refsource_MLIST"]}],"techniques":[],"reports":[],"affected":[{"ecosystem":"Maven","package":"org.apache.tomcat:tomcat","vulnerableRanges":[">=4.1.0, <4.1.40",">=5.0.0, <5.5.28",">=6.0.0, <6.0.19"],"patched":["4.1.40","5.5.28","6.0.19"],"from":["GHSA-w227-xcfx-3pj8"],"provenance":"source"}],"advisories":[{"id":"GHSA-w227-xcfx-3pj8","url":"https://github.com/advisories/GHSA-w227-xcfx-3pj8","severity":"MODERATE","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","vulnerableRanges":[">=4.1.0, <4.1.40"],"patched":["4.1.40"],"provenance":"source","from":"GHSA"},{"id":"GHSA-w227-xcfx-3pj8","url":"https://github.com/advisories/GHSA-w227-xcfx-3pj8","severity":"MODERATE","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","vulnerableRanges":[">=5.0.0, <5.5.28"],"patched":["5.5.28"],"provenance":"source","from":"GHSA"},{"id":"GHSA-w227-xcfx-3pj8","url":"https://github.com/advisories/GHSA-w227-xcfx-3pj8","severity":"MODERATE","ecosystem":"Maven","package":"org.apache.tomcat:tomcat","vulnerableRanges":[">=6.0.0, <6.0.19"],"patched":["6.0.19"],"provenance":"source","from":"GHSA"}],"euvd":{"id":"EUVD-2022-5460","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-5460","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[{"id":33023,"url":"https://www.exploit-db.com/exploits/33023","title":"Apache Tomcat 6.0.18 - Form Authentication Existing/Non-Existing 'Username' Enumeration","type":"remote","platform":"multiple","date":"2009-06-03","verified":true,"provenance":"source"}],"exploitSources":{"exploitdb":{"count":1,"earliest":"2009-06-03"},"metasploit":[{"name":"Apache Tomcat User Enumeration","module":"auxiliary/scanner/http/tomcat_enum","type":"auxiliary","disclosureDate":null,"url":"https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/http/tomcat_enum.rb"}],"first":{"date":"2009-06-03","source":"Exploit-DB","url":"https://www.exploit-db.com/exploits/33023"},"provenance":"source"},"exploitRefs":[],"flow":[],"timeline":[{"date":"2009-06-03","kind":"exploit-public","label":"First public exploit: Exploit-DB (EDB-33023)","url":"https://www.exploit-db.com/exploits/33023","provenance":"source"},{"date":"2009-06-05","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2009-0580","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":"Exploit-DB","daysToKev":null},"priority":{"score":25.0,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.97,"detail":"percentile 0.9985"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 Exploit-DB entry; 1 Metasploit module"},{"name":"Mentioned in OTX pulses","points":0.0,"detail":"0 pulses"},{"name":"CVSS severity","points":0.0,"detail":"no CVSS"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]},"lineage":{"packageHistory":[{"cve":"CVE-2008-1947","published":"2008-06-04","fixed":"6.0.18","kev":false},{"cve":"CVE-2008-2370","published":"2008-08-04","fixed":"6.0.18","kev":false},{"cve":"CVE-2008-2938","published":"2008-08-13","fixed":"6.0.18","kev":false,"link":{"from":"CVE-2008-2938","to":"CVE-2009-0580","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Maven:org.apache.tomcat:tomcat","fromFixed":"4.1.39","toFixed":"4.1.40","daysApart":296},{"kind":"version-step","provenance":"source","package":"Maven:org.apache.tomcat:tomcat","fromFixed":"6.0.18","toFixed":"6.0.19","daysApart":296}]}},{"cve":"CVE-2009-0580","published":"2009-06-05","fixed":"6.0.19","kev":false},{"cve":"CVE-2008-5515","published":"2009-06-16","fixed":"6.0.20","kev":false,"link":{"from":"CVE-2009-0580","to":"CVE-2008-5515","relation":"successor","confidence":"low","kind":"sequence","evidence":[{"kind":"version-step","provenance":"source","package":"Maven:org.apache.tomcat:tomcat","fromFixed":"6.0.19","toFixed":"6.0.20","daysApart":11}]}},{"cve":"CVE-2009-0781","published":"2009-03-09","fixed":"6.0.20","kev":false},{"cve":"CVE-2009-0783","published":"2009-06-05","fixed":"6.0.20","kev":false,"link":{"from":"CVE-2009-0580","to":"CVE-2009-0783","relation":"successor","confidence":"low","kind":"sequence","orderedBy":"description","evidence":[{"kind":"version-step","provenance":"source","package":"Maven:org.apache.tomcat:tomcat","fromFixed":"6.0.19","toFixed":"6.0.20","daysApart":0}]}}],"package":"Maven:org.apache.tomcat:tomcat"}}