CVE-2017-2670

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

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

3.62%Up 1.0 points since Apr 14, 2021

What each source reports

CVE List Score used 7.5

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.

Record: CVE-2017-2670
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

EUVDEUVD-2018-0491 7.5

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.

Record: EUVD-2018-0491
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-3x7h-5hfr-hvjm 7.5

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

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.

Record: GHSA-3x7h-5hfr-hvjm
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

NVD 7.5

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.

Record: CVE-2017-2670
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-835
Updated: 2026-11-02

OSV 7.5

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.

Record: CVE-2017-2670
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-2670 7.5

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.

Record: DEBIAN-CVE-2017-2670
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

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OSVGHSA-3x7h-5hfr-hvjm 7.5

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

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.

Record: GHSA-3x7h-5hfr-hvjm
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

OSVRHSA-2017:1410 8.1

Red Hat Security Advisory: JBoss Enterprise Application Platform 7.0.6 on Red Hat Enterprise Linux 6

Record: RHSA-2017:1410
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVRHSA-2017:1411 8.1

Red Hat Security Advisory: JBoss Enterprise Application Platform 7.0.6 on Red Hat Enterprise Linux 7

Record: RHSA-2017:1411
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVRHSA-2017:1412 8.1

Red Hat Security Advisory: eap7-jboss-ec2-eap security update

Record: RHSA-2017:1412
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVRHSA-2017:3454 8.1

Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.0 security update

Record: RHSA-2017:3454
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVRHSA-2017:3455 8.1

Red Hat Security Advisory: Red Hat JBoss Enterprise Application Platform 7.1.0 security update

Record: RHSA-2017:3455
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVRHSA-2017:3458 8.1

Red Hat Security Advisory: eap7-jboss-ec2-eap security update

Record: RHSA-2017:3458
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-2670 7.5

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.

Record: UBUNTU-CVE-2017-2670
CVSS 3.0: 7.5 HighCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`io.undertow:undertow-core` Maven	before 1.3.28	1.3.28
`undertow` Debian:14	before 1.4.18-1, plus listed versions 1.3.11-11.3.16-11.3.19-11.3.21-11.3.23-1 Show 10 moreShow less 1.3.4-11.3.5-11.3.7-11.4.0-11.4.1-11.4.3-11.4.4-11.4.6-11.4.7-11.4.8-1	1.4.18-1
`undertow` Debian:9 From an advisory covering 2 CVEs	before 1.4.8-1+deb9u1, plus listed versions 1.4.8-1	1.4.8-1+deb9u1
`io.undertow:undertow-core` Maven	before 1.3.28, plus listed versions 1.0.0.Alpha11.0.0.Alpha101.0.0.Alpha111.0.0.Alpha121.0.0.Alpha13 Show 45 moreShow less 1.0.0.Alpha141.0.0.Alpha151.0.0.Alpha161.0.0.Alpha171.0.0.Alpha181.0.0.Alpha191.0.0.Alpha21.0.0.Alpha201.0.0.Alpha211.0.0.Alpha221.0.0.Alpha31.0.0.Alpha41.0.0.Alpha51.0.0.Alpha61.0.0.Alpha71.0.0.Alpha81.0.0.Alpha91.0.0.Beta11.0.0.Beta101.0.0.Beta111.0.0.Beta121.0.0.Beta131.0.0.Beta141.0.0.Beta151.0.0.Beta161.0.0.Beta171.0.0.Beta181.0.0.Beta191.0.0.Beta21.0.0.Beta201.0.0.Beta211.0.0.Beta221.0.0.Beta231.0.0.Beta241.0.0.Beta251.0.0.Beta261.0.0.Beta271.0.0.Beta281.0.0.Beta291.0.0.Beta31.0.0.Beta301.0.0.Beta311.0.0.Beta321.0.0.Beta331.0.0.Beta4	1.3.28
`eap7-activemq-artemis` Red Hat:jboss_enterprise_application_platform:7::el6 From an advisory covering 4 CVEs	before 0:1.1.0-17.SP20_redhat_1.1.ep7.el6	0:1.1.0-17.SP20_redhat_1.1.ep7.el6
`eap7-activemq-artemis-cli` Red Hat:jboss_enterprise_application_platform:7::el6 From an advisory covering 4 CVEs	before 0:1.1.0-17.SP20_redhat_1.1.ep7.el6	0:1.1.0-17.SP20_redhat_1.1.ep7.el6
`eap7-activemq-artemis-commons` Red Hat:jboss_enterprise_application_platform:7::el6 From an advisory covering 4 CVEs	before 0:1.1.0-17.SP20_redhat_1.1.ep7.el6	0:1.1.0-17.SP20_redhat_1.1.ep7.el6
`eap7-activemq-artemis-core-client` Red Hat:jboss_enterprise_application_platform:7::el6 From an advisory covering 4 CVEs	before 0:1.1.0-17.SP20_redhat_1.1.ep7.el6	0:1.1.0-17.SP20_redhat_1.1.ep7.el6
`eap7-activemq-artemis-dto` Red Hat:jboss_enterprise_application_platform:7::el6 From an advisory covering 4 CVEs	before 0:1.1.0-17.SP20_redhat_1.1.ep7.el6	0:1.1.0-17.SP20_redhat_1.1.ep7.el6
`eap7-activemq-artemis-hornetq-protocol` Red Hat:jboss_enterprise_application_platform:7::el6 From an advisory covering 4 CVEs	before 0:1.1.0-17.SP20_redhat_1.1.ep7.el6	0:1.1.0-17.SP20_redhat_1.1.ep7.el6

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History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-2670 is a high vulnerability (CVSS 7.5) in [unknown] Undertow, published July 11, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.62%, the 89th percentile. Fixed in io.undertow:undertow-core 1.3.28.

References

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This page doesn't list everything

Left out here: 211 package rows and 124 versions. The JSON record has them. Also not on the record: 281 package claims. ID and package lookups still check them.