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    CVE-2011-4858

    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.

    Published:Dec 28, 2011
    Last Modified:Apr 11, 2025
    EPS:Jan 5, 2012
    EPSS Score:0.73855
    CVSS Score:5

    Affected Products

    Vendor
    Apache
    Product
    Tomcat
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Jboss Communications Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Application Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Brms Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Portal Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Web Platform
    Vendor
    Redhat
    Product
    Jboss Enterprise Web Server
    Vendor
    Redhat
    Product
    Jboss Operations Network
    Vendor
    Redhat
    Product
    Jboss Soa Platform

    Exploits

    https://www.exploit-db.com/exploits/2012

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-73180 (CVSS 6.8) — Insufficient Session Expiration vulnerability in Apache Tomcat meant that if the session ID for an authenticat…
    CVE-2026-68763 (CVSS 7.5) — Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog …
    CVE-2026-68569 (CVSS 8.1) — Improper Authentication vulnerability in Apache Tomcat meant that in some circumstances (e.g. CLIENT-CERT, SPN…
    CVE-2026-68525 (CVSS 9.1) — Incorrect Authorization vulnerability in Apache Tomcat's FORM authentication process allows the bypassing of a…
    CVE-2026-66422 (CVSS 8.1) — Improper Authorization vulnerability in Apache Tomcat cause by security-role-ref definitions being incorrectly…
    CVE-2026-65927 (CVSS 7.5) — Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite pr…
    CVE-2026-65905 (CVSS 9.8) — Authentication Bypass by Capture-replay vulnerability in Apache Tomcat's DIGEST authenticator. If, before wind…
    CVE-2026-65637 (CVSS 9.8) — Improper Input Validation vulnerability in Apache Tomcat due to incomplete fix for CVE-2026-32990. This iss…
    CVE-2026-65183 (CVSS 8.1) — Time-of-check Time-of-use (TOCTOU) Race Condition vulnerability in Apache Tomcat when creating unix domain soc…
    CVE-2026-65182 (CVSS 9.1) — Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint b…

    References

    http://mail-archives.apache.org/mod_mbox/tomcat-announce/201112.mbox/%3c4EFB9800.5010106%40apache.org%3e
    http://marc.info/?l=bugtraq&m=132871655717248&w=2
    http://marc.info/?l=bugtraq&m=133294394108746&w=2
    http://marc.info/?l=bugtraq&m=136485229118404&w=2
    http://rhn.redhat.com/errata/RHSA-2012-0074.html
    http://rhn.redhat.com/errata/RHSA-2012-0075.html
    http://rhn.redhat.com/errata/RHSA-2012-0076.html
    http://rhn.redhat.com/errata/RHSA-2012-0077.html
    http://rhn.redhat.com/errata/RHSA-2012-0078.html
    http://rhn.redhat.com/errata/RHSA-2012-0089.html
    http://rhn.redhat.com/errata/RHSA-2012-0325.html
    http://rhn.redhat.com/errata/RHSA-2012-0406.html
    http://secunia.com/advisories/48549
    http://secunia.com/advisories/48790
    http://secunia.com/advisories/48791
    http://secunia.com/advisories/54971
    http://secunia.com/advisories/55115
    http://tomcat.apache.org/tomcat-7.0-doc/changelog.html
    http://www.debian.org/security/2012/dsa-2401
    http://www.kb.cert.org/vuls/id/903934
    http://www.nruns.com/_downloads/advisory28122011.pdf
    http://www.ocert.org/advisories/ocert-2011-003.html
    http://www.securityfocus.com/bid/51200
    https://bugzilla.redhat.com/show_bug.cgi?id=750521
    https://github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18886
    http://mail-archives.apache.org/mod_mbox/tomcat-announce/201112.mbox/%3c4EFB9800.5010106%40apache.org%3e
    http://marc.info/?l=bugtraq&m=132871655717248&w=2
    http://marc.info/?l=bugtraq&m=133294394108746&w=2
    http://marc.info/?l=bugtraq&m=136485229118404&w=2
    http://rhn.redhat.com/errata/RHSA-2012-0074.html
    http://rhn.redhat.com/errata/RHSA-2012-0075.html
    http://rhn.redhat.com/errata/RHSA-2012-0076.html
    http://rhn.redhat.com/errata/RHSA-2012-0077.html
    http://rhn.redhat.com/errata/RHSA-2012-0078.html
    http://rhn.redhat.com/errata/RHSA-2012-0089.html
    http://rhn.redhat.com/errata/RHSA-2012-0325.html
    http://rhn.redhat.com/errata/RHSA-2012-0406.html
    http://secunia.com/advisories/48549
    http://secunia.com/advisories/48790
    http://secunia.com/advisories/48791
    http://secunia.com/advisories/54971
    http://secunia.com/advisories/55115
    http://tomcat.apache.org/tomcat-7.0-doc/changelog.html
    http://www.debian.org/security/2012/dsa-2401
    http://www.kb.cert.org/vuls/id/903934
    http://www.nruns.com/_downloads/advisory28122011.pdf
    http://www.ocert.org/advisories/ocert-2011-003.html
    http://www.securityfocus.com/bid/51200
    https://bugzilla.redhat.com/show_bug.cgi?id=750521
    https://github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18886

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High