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CVE-2017-2670 Undertow

Affected softwareUndertow
Severity7.5 High CVSS 3.0 3 scores
Fixed in1.3.28
WeaknessCWE-835
Published27 Jul 2018
Updated17 Jun 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 8 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 3.6% chance in 30 days

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://access.redhat.com/security/cve/CVE-2017-2670 : a Red Hat CVE page: the weakest kind, naming no commit, though it shows Red Hat has looked at the CVE

CVSS

7.5 HIGH v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H secalert@redhat.com Secondary published
CVSS 3.0 7.5 HIGH CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary
CVSS 2.0 5.0 none AV:N/AC:L/Au:N/C:N/I:N/A:P NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.undertow:undertow-core 0 1.3.28 unbounded

Products and versions

4 products, 6 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 9.0
osv io.undertow undertow-core generic < 1.3.28
nvd redhat jboss enterprise application platform generic 6.0.0 · 7.0.0 · 7.1.0
nvd redhat undertow generic < 1.3.28

References

URLTags
https://access.redhat.com/security/cve/CVE-2017-2670 redhat-cve
https://access.redhat.com/errata/RHSA-2017:3454 ADVISORY, RHSA-2017:3454
https://access.redhat.com/errata/RHSA-2017:3455 ADVISORY, RHSA-2017:3455
https://github.com/advisories/GHSA-3x7h-5hfr-hvjm ADVISORY
http://rhn.redhat.com/errata/RHSA-2017-1409.html Vendor Advisory
http://www.securityfocus.com/bid/98965 Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:1410 Vendor Advisory
https://access.redhat.com/errata/RHSA-2017:1411 Vendor Advisory
https://access.redhat.com/errata/RHSA-2017:1412 Vendor Advisory
https://access.redhat.com/errata/RHSA-2017:3456 Vendor Advisory

Timeline

Published2018-07-27By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.