Skip to content
Fencer Vulns
critical 9.8

CVE-2016-6808 in the critical feed json

Buffer overflow in Apache Tomcat Connectors (mod_jk) before 1.2.42.

published 2017-04-12 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7701

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
22.7%
EPSS 22.7% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

Buffer overflow in Apache Tomcat Connectors (mod_jk) before 1.2.42.

Patch / fix

  • apache tomcat_jk_connector 1.2.42
  • jbcs-httpd24-httpd jboss core services 1 2.4.23-102.jbcs.el7
  • jbcs-httpd24-mod_jk jboss core services 1 1.2.41-14.redhat_1.jbcs.el7
  • jbcs-httpd24-mod_rt jboss core services 1 2.4.1-16.GA.jbcs.el7
  • jbcs-httpd24-mod_bmx jboss core services 1 0.9.6-14.GA.jbcs.el7
  • jbcs-httpd24-mod_ssl jboss core services 1 1:2.4.23-102.jbcs.el7
  • jbcs-httpd24-nghttp2 jboss core services 1 1.12.0-9.jbcs.el7
  • jbcs-httpd24-openssl jboss core services 1 1:1.0.2h-12.jbcs.el7
  • jbcs-httpd24-mod_ldap jboss core services 1 2.4.23-102.jbcs.el7

red hat advisories RHSA-2017:0194RHSA-2017:0193

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-2016-6808 updated cvss 8.1

mod_jk: Buffer overflow when concatenating virtual host name and URI

  • Red Hat JBoss Enterprise Application Platform 6 mod_jk mod_jk Red Hat JBoss Enterprise Web Server 2 mod_jk mod_jk Red Hat JBoss Enterprise Web Server 3 mod_jk mod_jk Red Hat JBoss Web Server 3 mod_jk mod_jk
    affected: no fix available
  • Red Hat JBoss Enterprise Application Platform 5 mod_jk mod_jk Red Hat JBoss Enterprise Web Server 1 mod_jk mod_jk
    under investigation
  • Red Hat JBoss Core Services
    fixed: vendor fix RHSA-2016:2957
  • Red Hat JBoss Core Services on RHEL 6 Server jbcs-httpd24-httpd 2.4.23-102.jbcs.el6, jbcs-httpd24-nghttp2 1.12.0-9.jbcs.el6, jbcs-httpd24-openssl 1.0.2h-12.jbcs.el6, jbcs-httpd24-mod_rt 2.4.1-16.GA.jbcs.el6, jbcs-httpd24-mod_ssl 2.4.23-102.jbcs.el6, jbcs-httpd24-mod_bmx 0.9.6-14.GA.jbcs.el6, +21 more
    fixed: vendor fix RHSA-2017:0193
  • Red Hat JBoss Core Services on RHEL 7 Server jbcs-httpd24-httpd 2.4.23-102.jbcs.el7, jbcs-httpd24-nghttp2 1.12.0-9.jbcs.el7, jbcs-httpd24-openssl 1.0.2h-12.jbcs.el7, jbcs-httpd24-mod_rt 2.4.1-16.GA.jbcs.el7, jbcs-httpd24-mod_ssl 2.4.23-102.jbcs.el7, jbcs-httpd24-mod_bmx 0.9.6-14.GA.jbcs.el7, +19 more
    fixed: vendor fix RHSA-2017:0194

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

22.68% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • packetstormsecurity.com http://packetstormsecurity.com/files/139071/Apache-Tomcat-JK-ISAPI-Connector-1.2.41-Buffer-Overflow.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.