CVE-2017-12165

LOWNVD 2.6

2.6

It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request smuggling.

CVSS v3: 2.6
EG Score: —
EPSS: 78.2%
KEV: Not listed

Published

July 27, 2018

Last Modified

November 21, 2024

References (20)

secalert@redhathttps://access.redhat.com/errata/RHSA-2017:3454
secalert@redhathttps://access.redhat.com/errata/RHSA-2017:3455
secalert@redhathttps://access.redhat.com/errata/RHSA-2017:3456
secalert@redhathttps://access.redhat.com/errata/RHSA-2017:3458
secalert@redhathttps://access.redhat.com/errata/RHSA-2018:0002
secalert@redhathttps://access.redhat.com/errata/RHSA-2018:0003
secalert@redhathttps://access.redhat.com/errata/RHSA-2018:0004
secalert@redhathttps://access.redhat.com/errata/RHSA-2018:0005
secalert@redhathttps://access.redhat.com/errata/RHSA-2018:1322
secalert@redhathttps://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-12165
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2017:3454
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2017:3455
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2017:3456
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2017:3458
af854a3a-2127-422b-91ae-364da2661108https://access.redhat.com/errata/RHSA-2018:0002

Affected Packages

(1 across 1 ecosystem)

Maven(1)

Package	Vulnerable range	Fixed in	Dependents
io.undertow:undertow-core	2.0.0.Alpha1	2.0.0.Beta1	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-444Inconsistent Interpretation of HTTP Requests (HTTP Request Smuggling)

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:38 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 18:05 UTCOSV refresh

Frequently asked(5)

What is CVE-2017-12165?

CVE-2017-12165 is a low vulnerability published on July 27, 2018. It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request smuggling.

When was CVE-2017-12165 disclosed?

CVE-2017-12165 was first published in the National Vulnerability Database on July 27, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2017-12165 actively exploited?

CVE-2017-12165 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 78.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2017-12165?

CVE-2017-12165 has a CVSS v3 base score of 2.6 (NVD).

How do I remediate CVE-2017-12165?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12165, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2017-12165

Explore →

Is Your Infrastructure Affected by CVE-2017-12165?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs