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CVE-2016-4800

33
FAUCET Score

CVE-2016-4800 describes a critical path normalization bypass vulnerability in Eclipse Jetty 9.3.x before 9.3.9 on Windows, affecting both Eclipse and Microsoft Jetty implementations. This flaw allows unauthenticated remote attackers to bypass security restrictions and access protected resources by manipulating URLs with escaped characters and backslashes. With a CVSS score of 9.8 (CRITICAL), the vulnerability has a high impact on confidentiality, integrity, and availability, requiring no user interaction or complex attack conditions. Despite its severity, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
9.3.0CPE matchmatch criteria
cpe:2.3:a:eclipse:jetty:9.3.0:*:*:*:*:*:*:*
9.3.0CPE matchmatch criteria
cpe:2.3:a:eclipse:jetty:9.3.0:m0:*:*:*:*:*:*
9.3.0CPE matchmatch criteria
cpe:2.3:a:eclipse:jetty:9.3.0:m1:*:*:*:*:*:*
9.3.0CPE matchmatch criteria
cpe:2.3:a:eclipse:jetty:9.3.0:maintenance2:*:*:*:*:*:*
9.3.0CPE matchmatch criteria
cpe:2.3:a:eclipse:jetty:9.3.0:rc0:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.36%
Probability of exploitation in next 30 days
EPSS Percentile
92.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0636 is in the 88th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.eclipse.jetty:jetty-serverFixed in: 9.3.9

Vendor Advisories (2)

mavenGHSA-872g-2h8h-362qcritical

Jetty contains an alias issue that could allow unauthenticated remote code execution due to specially crafted request

Oct 19, 2018
redhatCVE-2016-4800Moderate

jetty: path normalization

May 30, 2016

References

dev.eclipse.org / mhonarc/lists/jetty-announce/msg00092.html
PatchVendor Advisory
security.netapp.com / advisory/ntap-20190307-0006
oracle.com / security-alerts/cpuoct2020.html
ocert.org / advisories/ocert-2016-001.html
MitigationPatchThird Party Advisory
securityfocus.com / bid/90945
Third Party AdvisoryVDB Entry
zerodayinitiative.com / advisories/ZDI-16-362
Third Party AdvisoryVDB Entry