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Fencer Vulns
high 7.5

CVE-2017-2670 json

Moderate severity vulnerability that affects io.undertow:undertow-core

published 2018-07-27 8 y ago modified 2026-06-17 4 mo ago also GHSA-3x7h-5hfr-hvjm , EUVD-2018-0491

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

It was found in Undertow before 1.3.28 that with non-clean TCP close, the Websocket server gets into infinite loop on every IO thread, effectively causing DoS.

Patch / fix

  • maven io.undertow:undertow-core 1.3.28
  • redhat undertow 1.3.28
  • undertow Debian 14 1.4.18-1

debian advisories DEBIAN-CVE-2017-2670

  • eap7-jboss-ec2-eap jboss enterprise application platform 7 7.0.6-1.GA_redhat_1.ep7.el6
  • eap7-jboss-ec2-eap jboss enterprise application platform 7 7.0.6-1.GA_redhat_1.ep7.el7
  • eap7-jboss-ec2-eap-samples jboss enterprise application platform 7 7.0.6-1.GA_redhat_1.ep7.el6
  • eap7-jboss-ec2-eap-samples jboss enterprise application platform 7 7.0.6-1.GA_redhat_1.ep7.el7
  • eap7-wss4j jboss enterprise application platform 7 2.1.8-2.redhat_1.1.ep7.el7
  • eap7-wildfly jboss enterprise application platform 7 7.0.6-4.GA_redhat_2.1.ep7.el7
  • eap7-resteasy jboss enterprise application platform 7 3.0.19-5.SP3_redhat_1.1.ep7.el7
  • eap7-undertow jboss enterprise application platform 7 1.3.28-4.Final_redhat_4.1.ep7.el7

red hat advisories RHSA-2017:1412RHSA-2017:1411RHSA-2017:1410RHSA-2017:3458RHSA-2017:3455RHSA-2017:3454

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-2017-2670 updated cvss 7.5

undertow: IO thread DoS via unclean Websocket closing

  • Red Hat Fuse 7 karaf karaf Red Hat JBoss Data Grid 7 undertow undertow
    affected: no fix available
  • Red Hat JBoss Fuse 6 karaf karaf
    affected: no fix planned “Will not fix”
  • Red Hat JBoss Fuse Integration Service 2 undertow undertow Red Hat Single Sign-On 7 wildfly wildfly
    affected: no fix available
  • Red Hat JBoss Data Grid 7.1
    fixed: vendor fix RHSA-2017:3244
  • Red Hat JBoss EAP 7.0
    fixed: vendor fix RHSA-2017:1409
  • 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-wss4j 2.1.8-2.redhat_1.1.ep7.el6, eap7-wildfly 7.0.6-4.GA_redhat_2.1.ep7.el6, eap7-apache-cxf 3.1.10-2.redhat_1.1.ep7.el6, eap7-wss4j-policy 2.1.8-2.redhat_1.1.ep7.el6, eap7-resteasy 3.0.19-5.SP3_redhat_1.1.ep7.el6, eap7-apache-cxf-rt 3.1.10-2.redhat_1.1.ep7.el6, +99 more
    fixed: vendor fix RHSA-2017:1410
  • Red Hat JBoss Enterprise Application Platform 7.0 for RHEL 7 Server eap7-wss4j 2.1.8-2.redhat_1.1.ep7.el7, eap7-wildfly 7.0.6-4.GA_redhat_2.1.ep7.el7, eap7-apache-cxf 3.1.10-2.redhat_1.1.ep7.el7, eap7-wss4j-policy 2.1.8-2.redhat_1.1.ep7.el7, eap7-resteasy 3.0.19-5.SP3_redhat_1.1.ep7.el7, eap7-apache-cxf-rt 3.1.10-2.redhat_1.1.ep7.el7, +99 more
    fixed: vendor fix RHSA-2017:1412
show 3 more
  • 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
  • Red Hat Single Sign-On 7.2.1 zip
    fixed: vendor fix RHSA-2018:0501

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

3.62% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
maven io.undertow:undertow-core
<1.3.28
1.3.28

Affected products

  • [UNKNOWN] undertow

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.