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CVE-2017-7559 Undertow

Affected softwareUndertow
Severity6.1 Medium CVSS 3.0 2 scores
Fixed in1.4.17.Final, 1.3.31.Final, 2.0.0.Alpha2
WeaknessCWE-444
Published10 Jan 2018
Updated17 Jun 2026

Description

In Undertow 2.x before 2.0.0.Alpha2, 1.4.x before 1.4.17.Final, and 1.3.x before 1.3.31.Final, it was found that the fix for CVE-2017-2666 was incomplete and invalid characters are still allowed in the query string and path parameters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.

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 1.9% 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 Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory
Finding This CVE is MEDIUM severity, is not listed in CISA KEV or VulnCheck KEV, has no public exploit or PoC in any indexed source, carries no CISA Vulnrichment finding of a demonstrated exploit, and is not part of an Oracle Critical Patch Update. None of the signals that would put it in front of an engineer is present, and the volume of CVEs below that bar is too great to take one at a time, so no rule is written for it. This is a decision about what we act on, not a finding that the CVE is harmless — a patch may well be derivable, and a low-severity defect can still be one link in a longer chain.
Candidate fix https://access.redhat.com/security/cve/CVE-2017-7559 : a Red Hat CVE page: the weakest kind, naming no commit, though it shows Red Hat has looked at the CVE

CVSS

6.1 MEDIUM v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 2 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 6.1 MEDIUM CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N NVD Primary published
CVSS 2.0 5.8 none AV:N/AC:M/Au:N/C:P/I:P/A:N NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.undertow:undertow-core 1.4.0 1.4.17.Final unbounded
io.undertow:undertow-core 1.3.0 1.3.31.Final unbounded
io.undertow:undertow-core 2.0.0.Alpha1 2.0.0.Alpha2 unbounded

Products and versions

2 products, 6 version entries
SourceVendorProductSchemeAffected versions
osv io.undertow undertow-core generic ≥ 1.3.0 and < 1.3.31 · ≥ 1.4.0 and < 1.4.17 · ≥ 2.0.0 and < 2.0.0
nvd redhat undertow generic ≥ 1.3.0 and < 1.3.31 · ≥ 1.4.0 and < 1.4.17 · 2.0.0:alpha1

References

URLTags
https://access.redhat.com/security/cve/CVE-2017-7559 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://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7559 WEB
https://github.com/undertow-io/undertow PACKAGE
https://issues.jboss.org/browse/UNDERTOW-1251 WEB
https://access.redhat.com/errata/RHSA-2017:3456 Vendor Advisory
https://access.redhat.com/errata/RHSA-2017:3458 Vendor Advisory
https://access.redhat.com/errata/RHSA-2018:0002 Vendor Advisory
https://access.redhat.com/errata/RHSA-2018:0003 Vendor Advisory

Timeline

Published2018-01-10By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.