CVE-2009-0580
Description
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.
Official description from the CVE record, published by redhat. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org
Key data
EPSS
Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
- Score
- 0.94440 (94.4% probability)
- Percentile
- 99.9%
- Scores of
- Nov 10, 2026
- Model
- v2026.06.15
References
Links listed in the CVE record. They lead to other sites, which CubePath does not control.
- oval:org.mitre.oval:def:9101 (oval.cisecurity.org)vdb-entrysignature
- tomcat.apache.org/security-4.html
- oval:org.mitre.oval:def:18915 (oval.cisecurity.org)vdb-entrysignature
- HPSBMA02535 (marc.info)vendor-advisory
- 35326 (secunia.com)third-party-advisory
- MDVSA-2009:138 (mandriva.com)vendor-advisory
- FEDORA-2009-11356 (redhat.com)vendor-advisory
- DSA-2207 (debian.org)vendor-advisory
- 35196 (securityfocus.com)vdb-entry
- 35344 (secunia.com)third-party-advisory
- HPSBUX02860 (marc.info)vendor-advisory
- 37460 (secunia.com)third-party-advisory
- ADV-2010-3056 (vupen.com)vdb-entry
- vmware.com/security/advisories/VMSA-2009-0016.html
- 35788 (secunia.com)third-party-advisory
- 20090605 [SECURITY] CVE-2009-0580 UPDATED Apache Tomcat User enumeration vulnerability with FORM authentication (securityfocus.com)mailing-list
- svn.apache.org/viewvc?rev=747840&view=rev
- 20090603 [SECURITY] CVE-2009-0580 Apache Tomcat User enumeration vulnerability with FORM authentication (securityfocus.com)mailing-list
- APPLE-SA-2010-03-29-1 (lists.apple.com)vendor-advisory
- ADV-2009-1496 (vupen.com)vdb-entry
- HPSBOV02762 (marc.info)vendor-advisory
- 20090604 Re: [SECURITY] CVE-2009-0580 Apache Tomcat User enumeration vulnerability with FORM authentication (securityfocus.com)mailing-list
- svn.apache.org/viewvc?rev=781382&view=rev
- oval:org.mitre.oval:def:6628 (oval.cisecurity.org)vdb-entrysignature
- ADV-2009-1856 (vupen.com)vdb-entry
- 1022332 (securitytracker.com)vdb-entry
- MDVSA-2010:176 (mandriva.com)vendor-advisory
- 20091120 VMSA-2009-0016 VMware vCenter and ESX update release and vMA patch release address multiple security issue in third party components (securityfocus.com)mailing-list
- 42368 (secunia.com)third-party-advisory
- tomcat.apache.org/security-6.html
- support.apple.com/kb/HT4077
- FEDORA-2009-11374 (redhat.com)vendor-advisory
- 35685 (secunia.com)third-party-advisory
- FEDORA-2009-11352 (redhat.com)vendor-advisory
- tomcat.apache.org/security-5.html
- SUSE-SR:2009:012 (lists.opensuse.org)vendor-advisory
- HPSBUX02579 (marc.info)vendor-advisory
- tomcat-jsecuritycheck-info-disclosure(50930) (exchange.xforce.ibmcloud.com)vdb-entry
- svn.apache.org/viewvc?rev=781379&view=rev
- MDVSA-2009:136 (mandriva.com)vendor-advisory
- 263529 (sunsolve.sun.com)vendor-advisory
- ADV-2009-3316 (vupen.com)vdb-entry
- [tomcat-dev] 20190319 svn commit: r1855831 [21/30] - in /tomcat/site/trunk: ./ docs/ xdocs/ (lists.apache.org)mailing-list
- [tomcat-dev] 20190319 svn commit: r1855831 [22/30] - in /tomcat/site/trunk: ./ docs/ xdocs/ (lists.apache.org)mailing-list
- [tomcat-dev] 20190325 svn commit: r1856174 [19/29] - in /tomcat/site/trunk: docs/ xdocs/ xdocs/stylesheets/ (lists.apache.org)mailing-list
- [tomcat-dev] 20190325 svn commit: r1856174 [20/29] - in /tomcat/site/trunk: docs/ xdocs/ xdocs/stylesheets/ (lists.apache.org)mailing-list
- [tomcat-dev] 20200203 svn commit: r1873527 [22/30] - /tomcat/site/trunk/docs/ (lists.apache.org)mailing-list
- [tomcat-dev] 20200213 svn commit: r1873980 [24/34] - /tomcat/site/trunk/docs/ (lists.apache.org)mailing-list
- [tomcat-dev] 20200213 svn commit: r1873980 [25/34] - /tomcat/site/trunk/docs/ (lists.apache.org)mailing-list
Timeline
- ID reserved
- Record published
- Record last updated
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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:48 UTC. Sources and licenses