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CVE-2016-4800 Eclipse Jetty

Affected softwareEclipse Jetty
Severity9.8 Critical CVSS 3.0 2 scores
Fixed in9.3.9
WeaknessImproper access control (CWE-284)
Published13 Apr 2017
Updated17 Jun 2026

Description

The path normalization mechanism in PathResource class in Eclipse Jetty 9.3.x before 9.3.9 on Windows allows remote attackers to bypass protected resource restrictions and other security constraints via a URL with certain escaped characters, related to backslashes.

Exploitation status

Exploited

Real-world exploitation reported by VulnCheck KEV. CISA has not confirmed it.

  • CISA KEV not listed
  • VulnCheck KEV listed Exploitation reported in the wild. 2 citations · earliest 2026-07-20.
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 6.5% chance in 30 days

VulnCheck KEV

Exploitation evidence from VulnCheck Known Exploited Vulnerabilities (VulnCheck KEV), used under VulnCheck's community terms. View CVE-2016-4800 in VulnCheck (free account).

EvidenceSourceDetailDate
Reported exploitation f5.com /labs/articles/cve-2024-44000-litespeed-cache-account-takeover-ranks-in-june-s-top-threats 2026-07-20
Reported exploitation f5.com /labs/articles/cloud-takeover-mass-scanning-for-exposed-vite-endpoints-cve-2026-39364 2026-09-11

Waratek protection

Mitigation candidate

A kind of vulnerability Waratek's rules address, with exploit code published or exploitation reported. No rule exists and none is planned yet. The decision below says what we found to build a rule from.

  • Protection none
  • Action unverified
  • Review automated Inferred
  • Record active
Decided by The affected package being open source on Maven, so the fix can be read
Finding This CVE affects an open-source Java library published on Maven Central (Maven packages: org.eclipse.jetty:jetty-server), so it is squarely in ARMR's territory and the source needed to understand the defect is public. That makes it a candidate for an ARMR patch rule. No rule exists and none is scheduled: the diff between the affected and fixed versions has not been read, and a closer look may find no hook point ARMR can act on.

CVSS

9.8 CRITICAL v3.0 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H NVD Primary published
CVSS 2.0 7.5 none AV:N/AC:L/Au:N/C:P/I:P/A:P NVD Primary

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
org.eclipse.jetty:jetty-server 9.3.0 9.3.9 unbounded

Products and versions

2 products, 20 version entries
SourceVendorProductSchemeAffected versions
nvd eclipse jetty generic 9.3.0 · 9.3.0:m0 · 9.3.0:m1 · 9.3.0:rc0 · 9.3.0:rc1 · 9.3.0:maintenance2 · 9.3.1 · 9.3.2 · 9.3.3 · 9.3.4 · 9.3.4:rc0 · 9.3.4:rc1 · 9.3.5 · 9.3.6 · 9.3.7 · 9.3.7:rc0 · 9.3.7:rc1 · 9.3.8 · 9.3.8:rc0
osv org.eclipse.jetty jetty-server generic ≥ 9.3.0 and < 9.3.9

References

URLTags
https://github.com/advisories/GHSA-872g-2h8h-362q ADVISORY
https://security.netapp.com/advisory/ntap-20190307-0006 WEB
https://www.oracle.com/security-alerts/cpuoct2020.html WEB
http://dev.eclipse.org/mhonarc/lists/jetty-announce/msg00092.html WEB
http://www.ocert.org/advisories/ocert-2016-001.html WEB
http://www.securityfocus.com/bid/90945 WEB
http://www.zerodayinitiative.com/advisories/ZDI-16-362 WEB
https://security.netapp.com/advisory/ntap-20190307-0006/

Timeline

Published2017-04-13By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.
VulnCheck KEV: earliest evidence2026-07-20Date of the oldest evidence of exploitation in VulnCheck KEV's record. VulnCheck does not publish the date it listed the CVE.
VulnCheck KEV: latest evidence2026-09-11Date of the newest report, exploit reference or honeypot sighting in VulnCheck KEV's record.