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Fencer Intel
low 2.6

CVE-2012-4534 json

org/apache/tomcat/util/net/NioEndpoint.java in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28, when the NIO connector is used in con…

published 2012-12-19 13 y ago modified 2026-10-09 31 d ago also EUVD-2012-4462

cvss
2.6
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.5%
EPSS 7.5% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

org/apache/tomcat/util/net/NioEndpoint.java in Apache Tomcat 6.x before 6.0.36 and 7.x before 7.0.28, when the NIO connector is used in conjunction with sendfile and HTTPS, allows remote attackers to cause a denial of service (infinite loop) by terminating the connection during the reading of a response.

Patch / fix

  • tomcat6 RHEL 6 6.0.24-52.el6_4
  • tomcat6-lib RHEL 6 6.0.24-52.el6_4
  • tomcat6-javadoc RHEL 6 6.0.24-52.el6_4
  • tomcat6-webapps RHEL 6 6.0.24-52.el6_4
  • tomcat6-el-2.1-api RHEL 6 6.0.24-52.el6_4
  • tomcat6-docs-webapp RHEL 6 6.0.24-52.el6_4
  • tomcat6-jsp-2.1-api RHEL 6 6.0.24-52.el6_4
  • tomcat6-admin-webapps RHEL 6 6.0.24-52.el6_4

red hat advisories RHSA-2013:0623RHSA-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-2012-4534 updated cvss 4.3

Tomcat - Denial Of Service when using NIO+SSL+sendfile

  • Red Hat Enterprise Linux Desktop Optional (v. 6) tomcat6 6.0.24-52.el6_4, tomcat6-lib 6.0.24-52.el6_4, tomcat6-javadoc 6.0.24-52.el6_4, tomcat6-webapps 6.0.24-52.el6_4, tomcat6-el-2.1-api 6.0.24-52.el6_4, tomcat6-docs-webapp 6.0.24-52.el6_4, +3 more Red Hat Enterprise Linux HPC Node Optional (v. 6) tomcat6 6.0.24-52.el6_4, tomcat6-lib 6.0.24-52.el6_4, tomcat6-javadoc 6.0.24-52.el6_4, tomcat6-webapps 6.0.24-52.el6_4, tomcat6-el-2.1-api 6.0.24-52.el6_4, tomcat6-docs-webapp 6.0.24-52.el6_4, +3 more Red Hat Enterprise Linux Server (v. 6) tomcat6 6.0.24-52.el6_4, tomcat6-lib 6.0.24-52.el6_4, tomcat6-el-2.1-api 6.0.24-52.el6_4, tomcat6-jsp-2.1-api 6.0.24-52.el6_4, tomcat6-servlet-2.5-api 6.0.24-52.el6_4 Red Hat Enterprise Linux Server Optional (v. 6) tomcat6 6.0.24-52.el6_4, tomcat6-javadoc 6.0.24-52.el6_4, tomcat6-webapps 6.0.24-52.el6_4, tomcat6-docs-webapp 6.0.24-52.el6_4, tomcat6-admin-webapps 6.0.24-52.el6_4 Red Hat Enterprise Linux Workstation (v. 6) tomcat6 6.0.24-52.el6_4, tomcat6-lib 6.0.24-52.el6_4, tomcat6-el-2.1-api 6.0.24-52.el6_4, tomcat6-jsp-2.1-api 6.0.24-52.el6_4, tomcat6-servlet-2.5-api 6.0.24-52.el6_4 Red Hat Enterprise Linux Workstation Optional (v. 6) tomcat6 6.0.24-52.el6_4, tomcat6-javadoc 6.0.24-52.el6_4, tomcat6-webapps 6.0.24-52.el6_4, tomcat6-docs-webapp 6.0.24-52.el6_4, tomcat6-admin-webapps 6.0.24-52.el6_4
    fixed: vendor fix RHSA-2013:0623
  • 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 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 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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
31 d ago

Exploit prediction

7.45% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • issues.apache.org https://issues.apache.org/bugzilla/show_bug.cgi?id=52858 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 2.6 AV:N/AC:H/Au:N/C:N/I:N/A:P

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.