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Fencer Intel
medium 4.4

CVE-2011-2526 json

Improper Input Validation in Apache Tomcat

published 2011-07-14 15 y ago modified 2026-06-16 4 mo ago also GHSA-9ggm-7897-x4mg , EUVD-2022-3373

cvss
4.4
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits
0
none known

Summary

Apache Tomcat 5.5.x before 5.5.34, 6.x before 6.0.33, and 7.x before 7.0.19, when sendfile is enabled for the HTTP APR or HTTP NIO connector, does not validate certain request attributes, which allows local users to bypass intended file access restrictions or cause a denial of service (infinite loop or JVM crash) by leveraging an untrusted web application.

Patch / fix

  • maven org.apache.tomcat:tomcat 5.5.34, 6.0.33, 7.0.19
  • tomcat6 jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el5
  • tomcat6 jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el6
  • tomcat6-lib jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el5
  • tomcat6-lib jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el6
  • tomcat6-log4j jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el5
  • tomcat6-log4j jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el6
  • tomcat6-javadoc jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el5
  • tomcat6-javadoc jboss enterprise web server 1 6.0.32-24_patch_07.ep5.el6

red hat advisories RHSA-2012:0682RHSA-2012:0076RHSA-2012:0074RHSA-2012:0680RHSA-2011:1780

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-2011-2526 updated cvss 2.6

tomcat: security manager restrictions bypass

  • Red Hat JBoss Communications Platform 5.1
    fixed: vendor fix RHSA-2012:0078
  • Red Hat JBoss Enterprise BRMS Platform 5.1
    fixed: vendor fix RHSA-2012:0325
  • Red Hat Enterprise Linux Server (v. 6) tomcat6 6.0.24-35.el6_1, tomcat6-lib 6.0.24-35.el6_1, tomcat6-el-2.1-api 6.0.24-35.el6_1, tomcat6-jsp-2.1-api 6.0.24-35.el6_1, tomcat6-servlet-2.5-api 6.0.24-35.el6_1 Red Hat Enterprise Linux Server Optional (v. 6) tomcat6 6.0.24-35.el6_1, tomcat6-javadoc 6.0.24-35.el6_1, tomcat6-webapps 6.0.24-35.el6_1, tomcat6-docs-webapp 6.0.24-35.el6_1, tomcat6-admin-webapps 6.0.24-35.el6_1
    fixed: vendor fix RHSA-2011:1780
  • Red Hat JBoss Enterprise Application Platform 4.3
    fixed: vendor fix RHSA-2012:0041
  • Red Hat JBoss Enterprise Application Platform 5 for RHEL 4 AS jbossweb 2.1.12-3_patch_03.2.ep5.el4, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el4, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el4 Red Hat JBoss Enterprise Application Platform 5 for RHEL 4 ES jbossweb 2.1.12-3_patch_03.2.ep5.el4, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el4, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el4 Red Hat JBoss Enterprise Application Platform 5 for RHEL 5 Server jbossweb 2.1.12-3_patch_03.2.ep5.el5, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el5, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el5, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el5, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el5 Red Hat JBoss Enterprise Application Platform 5 for RHEL 6 Server jbossweb 2.1.12-3_patch_03.2.ep5.el6, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el6, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el6, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el6, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el6
    fixed: vendor fix RHSA-2012:0074
  • Red Hat JBoss Enterprise Application Platform 5.1
    fixed: vendor fix RHSA-2012:0075
  • Red Hat JBoss Enterprise Web Server 1 for RHEL 5 Server tomcat5 5.5.33-27_patch_07.ep5.el5, tomcat6 6.0.32-24_patch_07.ep5.el5, tomcat6-lib 6.0.32-24_patch_07.ep5.el5, tomcat6-log4j 6.0.32-24_patch_07.ep5.el5, tomcat5-jasper 5.5.33-27_patch_07.ep5.el5, tomcat5-parent 5.5.33-27_patch_07.ep5.el5, +17 more Red Hat JBoss Enterprise Web Server 1 for RHEL 6 Server tomcat5 5.5.33-28_patch_07.ep5.el6, tomcat6 6.0.32-24_patch_07.ep5.el6, tomcat6-lib 6.0.32-24_patch_07.ep5.el6, tomcat6-log4j 6.0.32-24_patch_07.ep5.el6, tomcat5-jasper 5.5.33-28_patch_07.ep5.el6, tomcat5-parent 5.5.33-28_patch_07.ep5.el6, +17 more
    fixed: vendor fix RHSA-2012:0680
  • Red Hat JBoss Portal 4.3
    fixed: vendor fix RHSA-2012:0091
show 5 more
  • Red Hat JBoss Portal 5.2 Red Hat JBoss SOA Platform 5.2
    fixed: vendor fix RHSA-2012:0325
  • Red Hat JBoss Web Platform 5 for RHEL 5 Server jbossweb 2.1.12-3_patch_03.2.ep5.el5, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el5, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el5, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el5, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el5 Red Hat JBoss Web Platform 5 for RHEL 6 Server jbossweb 2.1.12-3_patch_03.2.ep5.el6, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el6, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el6, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el6, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el6
    fixed: vendor fix RHSA-2012:0076
  • Red Hat JBoss Web Platform 5.1
    fixed: vendor fix RHSA-2012:0077
  • Red Hat JBoss Web Server 1.0
    fixed: vendor fix RHSA-2012:0679
  • Red Hat Enterprise Linux 5 tomcat5 Red Hat JBoss Web Platform 5 for RHEL 4 AS jbossweb 2.1.12-3_patch_03.2.ep5.el4, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el4, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el4 Red Hat JBoss Web Platform 5 for RHEL 4 ES jbossweb 2.1.12-3_patch_03.2.ep5.el4, jbossweb-lib 2.1.12-3_patch_03.2.ep5.el4, jbossweb-el-1.0-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-jsp-2.1-api 2.1.12-3_patch_03.2.ep5.el4, jbossweb-servlet-2.5-api 2.1.12-3_patch_03.2.ep5.el4
    not affected: vulnerable code not present

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

0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.4 AV:L/AC:M/Au:N/C:P/I:P/A:P

Affected packages

ecosystem package affected fixed in
maven org.apache.tomcat:tomcat
<5.5.34
>=6.0.0, <6.0.33
>=7.0.0, <7.0.19
5.5.34
6.0.33
7.0.19

Classification

Weakness
  • CWE-20 Improper Input Validation

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.