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Fencer Intel
high 7.5

CVE-2017-6056 json

It was discovered that a programming error in the processing of HTTPS requests in the Apache Tomcat servlet and JSP engine may result in de…

published 2017-02-17 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-15124

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
7.6%
EPSS 7.6% chance of exploitation in 30 days, percentile 94%
public exploits
0
none known

Summary

It was discovered that a programming error in the processing of HTTPS requests in the Apache Tomcat servlet and JSP engine may result in denial of service via an infinite loop. The denial of service is easily achievable as a consequence of backporting a CVE-2016-6816 fix but not backporting the fix for Tomcat bug 57544. Distributions affected by this backporting issue include Debian (before 7.0.56-3+deb8u8 and 8.0.14-1+deb8u7 in jessie) and Ubuntu.

Patch / fix

  • tomcat7 Ubuntu 14.04 LTS 7.0.52-1ubuntu0.10
  • tomcat6 Ubuntu Pro 14.04 LTS 6.0.39-1ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2017-6056

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • jboss-ec2-eap jboss enterprise application platform 6 7.5.14-2.Final_redhat_2.ep6.el6
  • jboss-ec2-eap-samples jboss enterprise application platform 6 7.5.14-2.Final_redhat_2.ep6.el6
  • hornetq jboss enterprise application platform 6 2.3.25-19.SP17_redhat_1.1.ep6.el7
  • jbossts jboss enterprise application platform 6 1:4.17.39-1.Final_redhat_1.1.ep6.el7
  • jbossweb jboss enterprise application platform 6 7.5.21-2.Final_redhat_2.1.ep6.el7
  • resteasy jboss enterprise application platform 6 2.3.17-1.Final_redhat_1.1.ep6.el7
  • jboss-msc jboss enterprise application platform 6 1.1.7-1.SP1_redhat_1.1.ep6.el7
  • picketbox jboss enterprise application platform 6 4.1.4-1.Final_redhat_1.1.ep6.el7

red hat advisories RHSA-2017:0829RHSA-2017:0828RHSA-2017:0827RHSA-2017:0826

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-2017-6056 updated cvss 7.5

tomcat: Infinite loop in the processing of https requests

  • Red Hat JBoss Operations Network 3 CoreServer CoreServer
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Web Server 3 tomcat7 tomcat7, tomcat8 tomcat8
    affected: no fix available
  • Red Hat JBoss Enterprise Application Platform 6.4
    fixed: vendor fix RHSA-2017:0517
  • Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 5 Server jboss-msc 1.1.7-1.SP1_redhat_1.1.ep6.el5, hornetq 2.3.25-19.SP17_redhat_1.1.ep6.el5, apache-cxf 2.7.18-6.SP5_redhat_1.1.ep6.el5, jbossts 4.17.39-1.Final_redhat_1.1.ep6.el5, jbossweb 7.5.21-2.Final_redhat_2.1.ep6.el5, picketbox 4.1.4-1.Final_redhat_1.1.ep6.el5, +72 more
    fixed: vendor fix RHSA-2017:0826
  • Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 6 Server jboss-msc 1.1.7-1.SP1_redhat_1.1.ep6.el6, hornetq 2.3.25-19.SP17_redhat_1.1.ep6.el6, apache-cxf 2.7.18-6.SP5_redhat_1.1.ep6.el6, jbossts 4.17.39-1.Final_redhat_1.1.ep6.el6, jbossweb 7.5.21-2.Final_redhat_2.1.ep6.el6, picketbox 4.1.4-1.Final_redhat_1.1.ep6.el6, +74 more
    fixed: vendor fix RHSA-2017:0827
  • Red Hat JBoss Enterprise Application Platform 6.4 for RHEL 7 Server jboss-msc 1.1.7-1.SP1_redhat_1.1.ep6.el7, hornetq 2.3.25-19.SP17_redhat_1.1.ep6.el7, apache-cxf 2.7.18-6.SP5_redhat_1.1.ep6.el7, jbossts 4.17.39-1.Final_redhat_1.1.ep6.el7, jbossweb 7.5.21-2.Final_redhat_2.1.ep6.el7, picketbox 4.1.4-1.Final_redhat_1.1.ep6.el7, +72 more
    fixed: vendor fix RHSA-2017:0828
  • Red Hat Enterprise Linux 6 tomcat6, tomcat6-lib, tomcat6-log4j, tomcat6-javadoc, tomcat6-webapps, tomcat6-el-2.1-api, +4 more Red Hat Enterprise Linux 7 tomcat, tomcat-lib, tomcat-jsvc, tomcat-javadoc, tomcat-webapps, tomcat-el-2.2-api, +4 more Red Hat JBoss Enterprise Web Server 2 tomcat7 tomcat7 Red Hat Software Collections rh-java-common-tomcat-lib, rh-java-common-tomcat-javadoc, rh-java-common-tomcat-el-2.2-api, rh-java-common-tomcat-jsp-2.2-api, rh-java-common-tomcat-servlet-3.0-api
    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

7.58% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.