Skip to content
Fencer Vulns
high 7.5

CVE-2016-3110 json

mod_cluster Denial of Service vulnerability

published 2016-09-26 10 y ago modified 2026-06-17 4 mo ago also GHSA-68qq-3phh-53j7 , EUVD-2016-4163

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

mod_cluster, as used in Red Hat JBoss Web Server 2.1, allows remote attackers to cause a denial of service (Apache http server crash) via an MCMP message containing a series of = (equals) characters after a legitimate element.

Patch / fix

  • maven org.jboss.mod_cluster:mod_cluster-parent 1.3.3.Final
  • mod_jk jboss enterprise application platform 6 1.2.41-2.redhat_4.ep6.el7
  • httpd22 jboss enterprise web server 2, jboss enterprise application platform 6 2.2.26-56.ep6.el7
  • mod_ssl22 jboss enterprise web server 2, jboss enterprise application platform 6 1:2.2.26-56.ep6.el7
  • mod_ldap22 jboss enterprise application platform 6 2.2.26-56.ep6.el7
  • mod_jk-ap22 jboss enterprise application platform 6 1.2.41-2.redhat_4.ep6.el7
  • jbcs-httpd24 jboss enterprise web server 2, jboss enterprise application platform 6 1-3.jbcs.el7
  • httpd22-tools jboss enterprise web server 2, jboss enterprise application platform 6 2.2.26-56.ep6.el7
  • tomcat-native jboss enterprise web server 2, jboss enterprise application platform 6 1.1.34-5.redhat_1.ep6.el7

red hat advisories RHSA-2016:2054RHSA-2016:2055RHSA-2016:1649RHSA-2016:1648

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-2016-3110 updated cvss 5.1

mod_cluster: remotely Segfault Apache http server

  • Red Hat JBoss Enterprise Web Server 3 mod_cluster mod_cluster
    affected: no fix available
  • Red Hat JBoss Enterprise Application Platform 6.4
    fixed: vendor fix RHSA-2016:2056
  • Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 6 Server httpd 2.2.26-54.ep6.el6, jbcs-httpd24 1-3.jbcs.el6, mod_ssl 2.2.26-54.ep6.el6, mod_ldap 2.2.26-54.ep6.el6, httpd-tools 2.2.26-54.ep6.el6, httpd-manual 2.2.26-54.ep6.el6, +11 more
    fixed: vendor fix RHSA-2016:2055
  • Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 7 Server httpd22 2.2.26-56.ep6.el7, jbcs-httpd24 1-3.jbcs.el7, mod_ssl22 2.2.26-56.ep6.el7, mod_ldap22 2.2.26-56.ep6.el7, httpd22-tools 2.2.26-56.ep6.el7, httpd22-manual 2.2.26-56.ep6.el7, +11 more
    fixed: vendor fix RHSA-2016:2054
  • Red Hat JBoss Enterprise Web Server 2 for RHEL 6 Server httpd 2.2.26-54.ep6.el6, jbcs-httpd24 1-3.jbcs.el6, mod_ssl 2.2.26-54.ep6.el6, httpd-tools 2.2.26-54.ep6.el6, httpd-manual 2.2.26-54.ep6.el6, mod_jk 1.2.41-2.redhat_3.ep6.el6, +11 more
    fixed: vendor fix RHSA-2016:1649
  • Red Hat JBoss Enterprise Web Server 2 for RHEL 7 Server httpd22 2.2.26-56.ep6.el7, jbcs-httpd24 1-3.jbcs.el7, mod_ssl22 2.2.26-56.ep6.el7, httpd22-tools 2.2.26-56.ep6.el7, httpd22-manual 2.2.26-56.ep6.el7, mod_jk 1.2.41-2.redhat_3.ep6.el7, +11 more
    fixed: vendor fix RHSA-2016:1648
  • Red Hat JBoss Web Server 2.1
    fixed: vendor fix RHSA-2016:1650

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

3.64% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.0 7.5 CVSS:3.0/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.jboss.mod_cluster:mod_cluster-parent
<1.3.3.Final
1.3.3.Final

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns 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.