Loop with Unreachable Exit Condition ('Infinite Loop') Affecting undertow package, versions <1.4.18-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN14-UNDERTOW-13803845
- published2 Nov 2025
- disclosed27 Jul 2018
Introduced: 27 Jul 2018
CVE-2017-2670 (opens in a new tab)How to fix?
Upgrade Debian:14 undertow to version 1.4.18-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream undertow package and not the undertow package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
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.
References
- https://security-tracker.debian.org/tracker/CVE-2017-2670
- https://www.debian.org/security/2017/dsa-3906
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2670
- http://rhn.redhat.com/errata/RHSA-2017-1409.html
- 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
- http://www.securityfocus.com/bid/98965
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2017-2670