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Fencer Vulns
low 2.6

CVE-2017-12165 json

Undertow Request Smuggling vulnerability

published 2018-07-27 8 y ago modified 2026-06-17 4 mo ago also GHSA-5gg7-5wv8-4gcj , EUVD-2022-2579

cvss
2.6
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request smuggling.

Patch / fix

  • maven io.undertow:undertow-core 1.3.31, 1.4.17, 2.0.0.Beta1
  • redhat undertow 1.3.31, 1.4.17
  • undertow Debian 14 2.0.23-1

debian advisories DEBIAN-CVE-2017-12165

  • undertow Ubuntu 20.04 LTS 2.0.23-1

ubuntu advisories UBUNTU-CVE-2017-12165

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-jboss-ec2-eap jboss enterprise application platform 7 7.1.0-5.GA_redhat_5.ep7.el6
  • eap7-jboss-ec2-eap jboss enterprise application platform 7.1 7.1.0-5.GA_redhat_5.ep7.el7
  • eap7-jboss-ec2-eap-samples jboss enterprise application platform 7 7.1.0-5.GA_redhat_5.ep7.el6
  • eap7-jboss-ec2-eap-samples jboss enterprise application platform 7.1 7.1.0-5.GA_redhat_5.ep7.el7
  • eap7-ecj jboss enterprise application platform 7.1 4.6.1-1.redhat_1.1.ep7.el7
  • eap7-vdx jboss enterprise application platform 7.1 1.1.6-1.redhat_1.1.ep7.el7
  • eap7-xom jboss enterprise application platform 7.1 1.2.10-2.redhat_1.1.ep7.el7
  • eap7-txw2 jboss enterprise application platform 7.1 2.2.11-10.redhat_4.1.ep7.el7

red hat advisories RHSA-2017:3458RHSA-2017:3455RHSA-2017:3454RHSA-2018:0005RHSA-2018:0004RHSA-2018:0002

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-2017-12165 updated cvss 2.6

undertow: improper whitespace parsing leading to potential HTTP request smuggling

  • Red Hat Virtualization 4 eap7-undertow
    affected: no fix available
  • Red Hat JBoss A-MQ 6.3
    fixed: vendor fix RHSA-2018:1322
  • Red Hat JBoss EAP 7.0
    fixed: vendor fix RHSA-2018:0003
  • Red Hat JBoss EAP 7.1
    fixed: vendor fix RHSA-2017:3456
  • Red Hat JBoss Enterprise Application Platform 7.0 for RHEL 6 Server eap7-wildfly 7.0.9-4.GA_redhat_3.1.ep7.el6, eap7-resteasy 3.0.19-7.SP5_redhat_1.1.ep7.el6, eap7-jboss-ec2-eap 7.0.9-2.GA_redhat_2.ep7.el6, eap7-jgroups 3.6.12-1.Final_redhat_1.1.ep7.el6, eap7-undertow 1.3.31-3.Final_redhat_3.1.ep7.el6, eap7-hibernate 5.0.16-1.Final_redhat_1.1.ep7.el6, +51 more
    fixed: vendor fix RHSA-2018:0002
  • Red Hat JBoss Enterprise Application Platform 7.0 for RHEL 7 Server eap7-wildfly 7.0.9-4.GA_redhat_3.1.ep7.el7, eap7-resteasy 3.0.19-7.SP5_redhat_1.1.ep7.el7, eap7-jboss-ec2-eap 7.0.9-2.GA_redhat_2.ep7.el7, eap7-jgroups 3.6.12-1.Final_redhat_1.1.ep7.el7, eap7-undertow 1.3.31-3.Final_redhat_3.1.ep7.el7, eap7-hibernate 5.0.16-1.Final_redhat_1.1.ep7.el7, +51 more
    fixed: vendor fix RHSA-2018:0005
  • Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 6 Server eap7-ecj 4.6.1-1.redhat_1.1.ep7.el6, eap7-vdx 1.1.6-1.redhat_1.1.ep7.el6, eap7-xom 1.2.10-2.redhat_1.1.ep7.el6, eap7-jaxen 1.1.6-3.redhat_1.1.ep7.el6, eap7-jsoup 1.8.3-3.redhat_2.1.ep7.el6, eap7-antlr 2.7.7-35.redhat_7.1.ep7.el6, +281 more
    fixed: vendor fix RHSA-2017:3454
  • Red Hat JBoss Enterprise Application Platform 7.1 for RHEL 7 Server eap7-ecj 4.6.1-1.redhat_1.1.ep7.el7, eap7-vdx 1.1.6-1.redhat_1.1.ep7.el7, eap7-xom 1.2.10-2.redhat_1.1.ep7.el7, eap7-jaxen 1.1.6-3.redhat_1.1.ep7.el7, eap7-jsoup 1.8.3-3.redhat_2.1.ep7.el7, eap7-antlr 2.7.7-35.redhat_7.1.ep7.el7, +281 more
    fixed: vendor fix RHSA-2017:3458
show 2 more
  • Red Hat JBoss Fuse 6.3
    fixed: vendor fix RHSA-2018:1322
  • Red Hat Fuse 7 undertow undertow Red Hat JBoss Data Grid 7 wildfly-undertow Red Hat JBoss Fuse 6 undertow undertow Red Hat Single Sign-On 7 wildfly-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

1.86% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 2.6 CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:N
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
maven io.undertow:undertow-core
<1.3.31
>=1.4.0, <1.4.17
>=2.0.0.Alpha1, <2.0.0.Beta1
1.3.31
1.4.17
2.0.0.Beta1

Affected products

  • Red Hat undertow

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

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.