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Fencer Vulns
medium 6.1

CVE-2017-7559 json

Undertow vulnerable to Request Smuggling

published 2018-01-10 8 y ago modified 2026-06-17 4 mo ago also GHSA-rj76-h87p-r3wf , EUVD-2022-5183

cvss
6.1
version 3.0, NVD
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

In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.

Patch / fix

  • maven io.undertow:undertow-core 1.3.31.Final, 1.4.17.Final, 2.0.0.Alpha2
  • redhat undertow 1.3.31, 1.4.17
  • undertow Debian 14 1.4.23-1

debian advisories DEBIAN-CVE-2017-7559

  • 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-2017-7559 updated cvss 6.5

undertow: HTTP Request smuggling vulnerability (incomplete fix of CVE-2017-2666)

  • Red Hat JBoss Fuse 6 wildfly-undertow
    affected: no fix planned “Out of support scope”
  • 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 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

1.91% 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
NVD 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N
GitHub 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven io.undertow:undertow-core
>=1.4.0, <1.4.17.Final
>=1.3.0, <1.3.31.Final
>=2.0.0.Alpha1, <2.0.0.Alpha2
1.4.17.Final
1.3.31.Final
2.0.0.Alpha2

Affected products

  • Red Hat, Inc. 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.