What’s Vulnerable › Vulnerabilities

CVE-2017-2670

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-07-27 · updated 2026-06-17
• Weakness: CWE-835

Description

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.

Affected products

• Debian Linux: 9.0
• Red Hat JBoss EAP: 6.0.0, 7.0.0, 7.1.0
• Red Hat undertow: before 1.3.28 — fixed in 1.3.28

How to fix

Upgrade to a fixed version: Red Hat undertow 1.3.28. Check the vendor advisory for mitigations.

References

• http://rhn.redhat.com/errata/RHSA-2017-1409.html
• http://www.securityfocus.com/bid/98965
• https://access.redhat.com/errata/RHSA-2017:1410
• https://access.redhat.com/errata/RHSA-2017:1411
• https://access.redhat.com/errata/RHSA-2017:1412
• https://access.redhat.com/errata/RHSA-2017:3454
• https://access.redhat.com/errata/RHSA-2017:3455
• https://access.redhat.com/errata/RHSA-2017:3456
• https://access.redhat.com/errata/RHSA-2017:3458
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2670
• https://www.debian.org/security/2017/dsa-3906
• http://rhn.redhat.com/errata/RHSA-2017-1409.html

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