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Fencer Vulns
medium 5.3

CVE-2018-14642 json

Exposure of Sensitive Information to an Unauthorized Actor in Undertow

published 2018-09-18 8 y ago modified 2026-06-17 4 mo ago also GHSA-vf6r-mmhc-3xcm , EUVD-2022-5347

cvss
5.3
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

An information leak vulnerability was found in Undertow. If all headers are not written out in the first write() call then the code that handles flushing the buffer will always write out the full contents of the writevBuffer buffer, which may contain data from previous requests.

Patch / fix

  • maven io.undertow:undertow-core 2.0.19.FINAL
  • undertow Debian 14 2.0.23-1

debian advisories DEBIAN-CVE-2018-14642

  • undertow Ubuntu 20.04 LTS 2.0.23-1

ubuntu advisories UBUNTU-CVE-2018-14642

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

  • eap7-dom4j jboss enterprise application platform 7.2 2.1.1-2.redhat_00001.1.el7eap
  • eap7-jberet jboss enterprise application platform 7.2 1.3.2-1.Final_redhat_00001.1.el7eap
  • eap7-yasson jboss enterprise application platform 7.2 1.0.2-1.redhat_00001.1.el7eap
  • eap7-wildfly jboss enterprise application platform 7.2 7.2.1-6.GA_redhat_00004.1.el7eap
  • eap7-narayana jboss enterprise application platform 7.2 5.9.1-1.Final_redhat_00001.1.el7eap
  • eap7-resteasy jboss enterprise application platform 7.2 3.6.1-4.SP3_redhat_00001.1.el7eap
  • eap7-undertow jboss enterprise application platform 7.2 2.0.19-1.Final_redhat_00001.1.el7eap
  • eap7-hibernate jboss enterprise application platform 7.2 5.3.9-2.Final_redhat_00002.1.el7eap

red hat advisories RHSA-2019:1108RHSA-2019:1107RHSA-2019:0365RHSA-2019:0364RHEA-2019:1119

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-2018-14642 updated cvss 5.3

undertow: Infoleak in some circumstances where Undertow can serve data from a random buffer

  • Red Hat JBoss Enterprise Application Platform 6 jbossweb jbossweb Red Hat JBoss Fuse 6 undertow undertow Red Hat JBoss Fuse Integration Service 2 undertow undertow
    affected: no fix planned “Out of support scope”
  • Red Hat OpenShift Application Runtimes undertow undertow
    affected: no fix available
  • Red Hat JBoss EAP 7.2
    fixed: vendor fix RHSA-2019:1106
  • Red Hat JBoss EAP 7.2 for RHEL 6 Server eap7-dom4j 2.1.1-2.redhat_00001.1.el6eap, eap7-yasson 1.0.2-1.redhat_00001.1.el6eap, eap7-apache-cxf 3.2.7-1.redhat_00001.1.el6eap, eap7-byte-buddy 1.9.5-1.redhat_00001.1.el6eap, eap7-cxf-xjc-dv 3.2.3-2.redhat_00002.1.el6eap, eap7-cxf-xjc-ts 3.2.3-2.redhat_00002.1.el6eap, +152 more
    fixed: vendor fix RHSA-2019:1107
  • Red Hat JBoss EAP 7.2 for RHEL 7 Server eap7-dom4j 2.1.1-2.redhat_00001.1.el7eap, eap7-yasson 1.0.2-1.redhat_00001.1.el7eap, eap7-apache-cxf 3.2.7-1.redhat_00001.1.el7eap, eap7-byte-buddy 1.9.5-1.redhat_00001.1.el7eap, eap7-cxf-xjc-dv 3.2.3-2.redhat_00002.1.el7eap, eap7-cxf-xjc-ts 3.2.3-2.redhat_00002.1.el7eap, +154 more
    fixed: vendor fix RHSA-2019:1108
  • Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 6 Server eap7-dom4j 2.1.1-1.redhat_00001.1.ep7.el6, eap7-apache-cxf 3.1.16-2.redhat_2.1.ep7.el6, eap7-jandex 2.0.5-1.Final_redhat_1.1.ep7.el6, eap7-apache-cxf-rt 3.1.16-2.redhat_2.1.ep7.el6, eap7-wildfly 7.1.6-4.GA_redhat_00002.1.ep7.el6, eap7-jberet 1.2.7-1.Final_redhat_00001.1.ep7.el6, +70 more
    fixed: vendor fix RHSA-2019:0364
  • Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 7 Server eap7-dom4j 2.1.1-1.redhat_00001.1.ep7.el7, eap7-apache-cxf 3.1.16-2.redhat_2.1.ep7.el7, eap7-jandex 2.0.5-1.Final_redhat_1.1.ep7.el7, eap7-apache-cxf-rt 3.1.16-2.redhat_2.1.ep7.el7, eap7-wildfly 7.1.6-4.GA_redhat_00002.1.ep7.el7, eap7-jberet 1.2.7-1.Final_redhat_00001.1.ep7.el7, +70 more
    fixed: vendor fix RHSA-2019:0365
  • Red Hat Single Sign-On 7.2.6 zip
    fixed: vendor fix RHSA-2019:0380
show 3 more
  • Red Hat Single Sign-On 7.3.1 zip
    fixed: vendor fix RHSA-2019:1140
  • Red Hat Virtualization 4 Hypervisor for RHEL 7 rhvm-appliance 4.3-20190502.0.el7 Red Hat Virtualization 4 Management Agent for RHEL 7 Hosts rhvm-appliance 4.3-20190502.0.el7
    fixed: vendor fix RHEA-2019:1119
  • Red Hat Fuse 7 undertow undertow Red Hat JBoss Data Grid 7 undertow undertow Red Hat Single Sign-On 7 undertow undertow
    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

2.11% chance of exploitation in the next 30 days, higher than 81% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 5.3 CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
maven io.undertow:undertow-core
<2.0.19.FINAL
2.0.19.FINAL

Affected products

  • Red Hat undertow

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

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.