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CVE-2009-0580 Apache Tomcat

Affected softwareApache Tomcat
Severity4.3 Medium CVSS 2.0
Fixed in4.1.40, 5.5.28, 6.0.19
WeaknessInformation exposure (CWE-200)
Published5 Jun 2009
Updated16 Jun 2026

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.

Exploitation status

Working exploit published

A reviewed exploit catalogue lists ready-to-run exploit code for this CVE.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC 1 indexed Published artifacts you can open, in Exploit-DB; first seen 2009-06-03.
  • EPSS 94% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.9% of all scored CVEs.
IndexArtifactStarsFirst seen
Exploit-DB Apache Tomcat 6.0.18 - Form Authentication Existing/Non-Existing 'Username' Enumeration 2009-06-03

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

  • Protection none
  • Action unverified
  • Review automated Inferred
  • Record active
Decided by The affected package being open source on Maven, so the fix can be read
Finding This CVE affects an open-source Java library published on Maven Central (Maven packages: org.apache.tomcat:tomcat), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat:tomcat 4.1.0 4.1.40 unbounded
org.apache.tomcat:tomcat 5.0.0 5.5.28 unbounded
org.apache.tomcat:tomcat 6.0.0 6.0.19 unbounded

Products and versions

2 products, 90 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic 4.1.0 · 4.1.1 · 4.1.2 · 4.1.3 · 4.1.3:beta · 4.1.4 · 4.1.5 · 4.1.6 · 4.1.7 · 4.1.8 · 4.1.9 · 4.1.9:beta · 4.1.10 · 4.1.11 · 4.1.12 · 4.1.13 · 4.1.14 · 4.1.15 · 4.1.16 · 4.1.17 · 4.1.18 · 4.1.19 · 4.1.20 · 4.1.21 · 4.1.22 · 4.1.23 · 4.1.24 · 4.1.25 · 4.1.26 · 4.1.27 · 4.1.28 · 4.1.29 · 4.1.30 · 4.1.31 · 4.1.32 · 4.1.33 · 4.1.34 · 4.1.35 · 4.1.36 · 4.1.37 · 4.1.38 · 4.1.39 · 5.5.0 · 5.5.1 · 5.5.2 · 5.5.3 · 5.5.4 · 5.5.5 · 5.5.6 · 5.5.7 · 5.5.8 · 5.5.9 · 5.5.10 · 5.5.11 · 5.5.12 · 5.5.13 · 5.5.14 · 5.5.15 · 5.5.16 · 5.5.17 · 5.5.18 · 5.5.19 · 5.5.20 · 5.5.21 · 5.5.22 · 5.5.23 · 5.5.24 · 5.5.25 · 5.5.26 · 5.5.27 · 6.0.0 · 6.0.1 · 6.0.2 · 6.0.3 · 6.0.4 · 6.0.5 · 6.0.6 · 6.0.7 · 6.0.8 · 6.0.9 · 6.0.10 · 6.0.11 · 6.0.12 · 6.0.13 · 6.0.14 · 6.0.15 · 6.0.16
osv org.apache.tomcat tomcat generic ≥ 4.1.0 and < 4.1.40 · ≥ 5.0.0 and < 5.5.28 · ≥ 6.0.0 and < 6.0.19

References

URLTags
https://marc.info/?l=bugtraq&m=127420533226623&w=2 WEB
https://marc.info/?l=bugtraq&m=129070310906557&w=2 WEB
https://marc.info/?l=bugtraq&m=133469267822771&w=2 WEB
https://marc.info/?l=bugtraq&m=136485229118404&w=2 WEB
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18915 WEB
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6628 WEB
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9101 WEB
https://svn.apache.org/viewvc?rev=747840&view=rev WEB
https://svn.apache.org/viewvc?rev=781379&view=rev WEB
https://svn.apache.org/viewvc?rev=781382&view=rev WEB

Timeline

Published2009-06-05By the CVE Program.
NVD record modified2026-06-16NVD's own last-modified date for this record.