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Fencer Intel
medium 5.0

CVE-2012-2733 json

java/org/apache/coyote/http11/InternalNioInputBuffer.java in the HTTP NIO connector in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.2…

published 2012-11-16 13 y ago modified 2026-06-16 4 mo ago also EUVD-2012-2713

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
8.7%
EPSS 8.7% chance of exploitation in 30 days, percentile 95%
public exploits
0
none known

Summary

java/org/apache/coyote/http11/InternalNioInputBuffer.java in the HTTP NIO connector in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28 does not properly restrict the request-header size, which allows remote attackers to cause a denial of service (memory consumption) via a large amount of header data.

Patch / fix

  • tomcat6 jboss enterprise web server 2 6.0.35-6_patch_06.ep6.el5
  • tomcat6 jboss enterprise web server 2 6.0.35-29_patch_06.ep6.el6
  • tomcat6-lib jboss enterprise web server 2 6.0.35-6_patch_06.ep6.el5
  • tomcat6-lib jboss enterprise web server 2 6.0.35-29_patch_06.ep6.el6
  • tomcat6-log4j jboss enterprise web server 2 6.0.35-6_patch_06.ep6.el5
  • tomcat6-log4j jboss enterprise web server 2 6.0.35-29_patch_06.ep6.el6
  • tomcat6-javadoc jboss enterprise web server 2 6.0.35-6_patch_06.ep6.el5
  • tomcat6-javadoc jboss enterprise web server 2 6.0.35-29_patch_06.ep6.el6

red hat advisories RHSA-2013:0266

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-2012-2733 updated cvss 5.0

tomcat: HTTP NIO connector OOM DoS via a request with large headers

  • Red Hat JBoss Enterprise Web Server 2 for RHEL 5 Server tomcat6 6.0.35-6_patch_06.ep6.el5, tomcat6-lib 6.0.35-6_patch_06.ep6.el5, tomcat6-log4j 6.0.35-6_patch_06.ep6.el5, tomcat6-javadoc 6.0.35-6_patch_06.ep6.el5, tomcat6-webapps 6.0.35-6_patch_06.ep6.el5, tomcat6-el-1.0-api 6.0.35-6_patch_06.ep6.el5, +4 more Red Hat JBoss Enterprise Web Server 2 for RHEL 6 Server tomcat6 6.0.35-29_patch_06.ep6.el6, tomcat6-lib 6.0.35-29_patch_06.ep6.el6, tomcat6-log4j 6.0.35-29_patch_06.ep6.el6, tomcat6-javadoc 6.0.35-29_patch_06.ep6.el6, tomcat6-webapps 6.0.35-29_patch_06.ep6.el6, tomcat6-el-1.0-api 6.0.35-29_patch_06.ep6.el6, +4 more
    fixed: vendor fix RHSA-2013:0266
  • Red Hat JBoss Web Server 2.0
    fixed: vendor fix RHSA-2013:0265
  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat JBoss BRMS 5 jbossweb jbossweb Red Hat JBoss Data Grid 6 jbossweb jbossweb Red Hat JBoss Enterprise Web Server 2 tomcat7 tomcat7 Red Hat JBoss Operations Network 3 jbossweb jbossweb Red Hat JBoss Portal 5 jbossweb jbossweb
    +1 more products
    Red Hat JBoss SOA Platform 5 jbossweb jbossweb
    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

8.74% chance of exploitation in the next 30 days, higher than 95% 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

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.