Apache Tomcat 5.5.x < 5.5.35 Hash Collision Denial of Service

medium Log Correlation Engine Plugin ID 800626
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote web server is affected by a denial of service vulnerability.


Versions of Tomcat 5.x earlier than 5.5.35 are potentially affected by a denial of service vulnerability. Large numbers of crafted form parameters can cause excessive CPU consumption due to hash collisions.


Upgrade to Apache Tomcat 5.5.35 or later.

See Also




Plugin Details

Severity: Medium

ID: 800626

Family: Web Servers

Published: 2/22/2012

Updated: 2/22/2012

Nessus ID: 57540

Risk Information


Risk Factor: Medium

Base Score: 5

Temporal Score: 4.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: CVSS2#E:F/RL:OF/RC:C

Vulnerability Information

Patch Publication Date: 1/16/2012

Vulnerability Publication Date: 12/18/2011

Reference Information

CVE: CVE-2011-4858, CVE-2012-0022

BID: 51200, 51447