Skip to content
Fencer Intel
high 7.5

CVE-2011-0534 json

Apache Tomcat does not enforce the maxHttpHeaderSize limit

published 2011-02-10 15 y ago modified 2026-06-16 4 mo ago also GHSA-43v2-6grp-9pp9 , EUVD-2022-2286

cvss
7.5
version 3.1, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
7.9%
EPSS 7.9% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

Apache Tomcat 7.0.0 through 7.0.6 and 6.0.0 through 6.0.30 does not enforce the maxHttpHeaderSize limit for requests involving the NIO HTTP connector, which allows remote attackers to cause a denial of service (OutOfMemoryError) via a crafted request.

Patch / fix

  • maven org.apache.tomcat:tomcat 6.0.32, 7.0.8
  • tomcat6 jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el4
  • tomcat6 jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el5
  • tomcat6-lib jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el4
  • tomcat6-lib jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el5
  • tomcat6-log4j jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el4
  • tomcat6-log4j jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el5
  • tomcat6-javadoc jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el4
  • tomcat6-javadoc jboss enterprise web server 1 6.0.24-11.patch_03.ep5.el5

red hat advisories RHSA-2011:0348RHSA-2011:0335

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-0534 updated cvss 5.0

tomcat: remote DoS via NIO connector

  • Red Hat Enterprise Linux Desktop Optional (v. 6) tomcat6 6.0.24-24.el6_0, tomcat6-lib 6.0.24-24.el6_0, tomcat6-log4j 6.0.24-24.el6_0, tomcat6-javadoc 6.0.24-24.el6_0, tomcat6-webapps 6.0.24-24.el6_0, tomcat6-el-2.1-api 6.0.24-24.el6_0, +4 more Red Hat Enterprise Linux HPC Node Optional (v. 6) tomcat6 6.0.24-24.el6_0, tomcat6-lib 6.0.24-24.el6_0, tomcat6-log4j 6.0.24-24.el6_0, tomcat6-javadoc 6.0.24-24.el6_0, tomcat6-webapps 6.0.24-24.el6_0, tomcat6-el-2.1-api 6.0.24-24.el6_0, +4 more Red Hat Enterprise Linux Server (v. 6) tomcat6 6.0.24-24.el6_0, tomcat6-lib 6.0.24-24.el6_0, tomcat6-log4j 6.0.24-24.el6_0, tomcat6-javadoc 6.0.24-24.el6_0, tomcat6-webapps 6.0.24-24.el6_0, tomcat6-el-2.1-api 6.0.24-24.el6_0, +4 more Red Hat Enterprise Linux Server Optional (v. 6) tomcat6 6.0.24-24.el6_0, tomcat6-lib 6.0.24-24.el6_0, tomcat6-log4j 6.0.24-24.el6_0, tomcat6-javadoc 6.0.24-24.el6_0, tomcat6-webapps 6.0.24-24.el6_0, tomcat6-el-2.1-api 6.0.24-24.el6_0, +4 more Red Hat Enterprise Linux Workstation (v. 6) tomcat6 6.0.24-24.el6_0, tomcat6-lib 6.0.24-24.el6_0, tomcat6-log4j 6.0.24-24.el6_0, tomcat6-javadoc 6.0.24-24.el6_0, tomcat6-webapps 6.0.24-24.el6_0, tomcat6-el-2.1-api 6.0.24-24.el6_0, +4 more Red Hat Enterprise Linux Workstation Optional (v. 6) tomcat6 6.0.24-24.el6_0, tomcat6-lib 6.0.24-24.el6_0, tomcat6-log4j 6.0.24-24.el6_0, tomcat6-javadoc 6.0.24-24.el6_0, tomcat6-webapps 6.0.24-24.el6_0, tomcat6-el-2.1-api 6.0.24-24.el6_0, +4 more
    fixed: vendor fix RHSA-2011:0335
  • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server tomcat6 6.0.24-11.patch_03.ep5.el5, tomcat6-lib 6.0.24-11.patch_03.ep5.el5, tomcat6-log4j 6.0.24-11.patch_03.ep5.el5, tomcat6-javadoc 6.0.24-11.patch_03.ep5.el5, tomcat6-webapps 6.0.24-11.patch_03.ep5.el5, tomcat6-el-1.0-api 6.0.24-11.patch_03.ep5.el5, +4 more
    fixed: vendor fix RHSA-2011:0348
  • Red Hat JBoss Web Server 1.0
    fixed: vendor fix RHSA-2011:0350
  • Red Hat JBoss Web Server 1.0 for RHEL 4 AS tomcat6 6.0.24-11.patch_03.ep5.el4, tomcat6-lib 6.0.24-11.patch_03.ep5.el4, tomcat6-log4j 6.0.24-11.patch_03.ep5.el4, tomcat6-javadoc 6.0.24-11.patch_03.ep5.el4, tomcat6-webapps 6.0.24-11.patch_03.ep5.el4, tomcat6-el-1.0-api 6.0.24-11.patch_03.ep5.el4, +4 more Red Hat JBoss Web Server 1.0 for RHEL 4 ES tomcat6 6.0.24-11.patch_03.ep5.el4, tomcat6-lib 6.0.24-11.patch_03.ep5.el4, tomcat6-log4j 6.0.24-11.patch_03.ep5.el4, tomcat6-javadoc 6.0.24-11.patch_03.ep5.el4, tomcat6-webapps 6.0.24-11.patch_03.ep5.el4, tomcat6-el-1.0-api 6.0.24-11.patch_03.ep5.el4, +4 more
    fixed: vendor fix RHSA-2011:0348

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

7.89% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat
>=6.0.0, <6.0.32
>=7.0.0, <7.0.8
6.0.32
7.0.8

Classification

Weakness
  • CWE-399 Resource Management Errors

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.