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CVE-2011-4858 Apache Tomcat

Affected softwareApache Tomcat
Severity5.0 Medium CVSS 2.0
Fixed in5.5.35, 6.0.35, 7.0.23
WeaknessImproper input validation (CWE-20)
Published5 Jan 2012
Updated16 Jun 2026

Description

Apache Tomcat before 5.5.35, 6.x before 6.0.35, and 7.x before 7.0.23 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

CWE-399

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 2006-07-15.
  • EPSS 80% chance in 30 days A model's forecast, not a report of exploitation. Higher than 99.6% of all scored CVEs.
IndexArtifactStarsFirst seen
Exploit-DB MyBulletinBoard (MyBB) 1.1.5 - 'CLIENT-IP' SQL Injection 2006-07-15

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 A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug
Finding A Red Hat Bugzilla ticket (https://bugzilla.redhat.com/show_bug.cgi?id=750521) tracks the fix. That makes this CVE a candidate for an ARMR patch rule. No rule exists and none is scheduled: whether one can be derived depends on reading the upstream change the ticket links.
Candidate fix https://bugzilla.redhat.com/show_bug.cgi?id=750521 : a Red Hat bug: the triage, which links onward to the fix

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.apache.tomcat:tomcat 5.5.0 5.5.35 unbounded
org.apache.tomcat:tomcat 6.0.0 6.0.35 unbounded
org.apache.tomcat:tomcat 7.0.0 7.0.23 unbounded

Products and versions

2 products, 62 version entries
SourceVendorProductSchemeAffected versions
nvd apache tomcat generic 5.5.35 · 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 · 6.0.17 · 6.0.18 · 6.0.19 · 6.0.20 · 6.0.21 · 6.0.22 · 6.0.23 · 6.0.24 · 6.0.25 · 6.0.26 · 6.0.27 · 6.0.28 · 6.0.29 · 6.0.30 · 6.0.31 · 6.0.32 · 6.0.33 · 6.0.34 · 7.0.0 · 7.0.1 · 7.0.2 · 7.0.3 · 7.0.4 · 7.0.5 · 7.0.6 · 7.0.7 · 7.0.8 · 7.0.9 · 7.0.10 · 7.0.11 · 7.0.12 · 7.0.13 · 7.0.14 · 7.0.15 · 7.0.16 · 7.0.17 · 7.0.18 · 7.0.19 · 7.0.20 · 7.0.21 · 7.0.22
osv org.apache.tomcat tomcat generic ≥ 5.5.0 and < 5.5.35 · ≥ 6.0.0 and < 6.0.35 · ≥ 7.0.0 and < 7.0.23

References

URLTags
https://bugzilla.redhat.com/show_bug.cgi?id=750521 bugzilla
https://github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py WEB
https://github.com/apache/tomcat PACKAGE
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18886 WEB
http://mail-archives.apache.org/mod_mbox/tomcat-announce/201112.mbox/%3c4EFB9800.5010106@apache.org%3e WEB
http://marc.info/?l=bugtraq&m=132871655717248&w=2 WEB
http://marc.info/?l=bugtraq&m=133294394108746&w=2 WEB
http://marc.info/?l=bugtraq&m=136485229118404&w=2 WEB
http://rhn.redhat.com/errata/RHSA-2012-0074.html WEB
http://rhn.redhat.com/errata/RHSA-2012-0075.html WEB

Timeline

Published2012-01-05By the CVE Program.
NVD record modified2026-06-16NVD's own last-modified date for this record.