CVE-2023-40167

MEDIUM

Jetty <9.4.52-12.0.1 - Info Disclosure

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2023-40167. PoCs published by ifrenkel, uthrasri.

AI-analyzed exploit summary The repository contains a minimal Java Maven project with placeholder code for security testing but lacks functional exploit code for CVE-2023-40167. It includes CI configurations and insecure coding practices for SAST/dependency scanning tests.

Description

Jetty is a Java based web server and servlet engine. Prior to versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1, Jetty accepts the `+` character proceeding the content-length value in a HTTP/1 header field. This is more permissive than allowed by the RFC and other servers routinely reject such requests with 400 responses. There is no known exploit scenario, but it is conceivable that request smuggling could result if jetty is used in combination with a server that does not close the connection after sending such a 400 response. Versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1 contain a patch for this issue. There is no workaround as there is no known exploit scenario.

Exploits (2)

gitlab STUB
by ifrenkel · poc
https://gitlab.com/ifrenkel/test-cve-2023-40167

The repository contains a minimal Java Maven project with placeholder code for security testing but lacks functional exploit code for CVE-2023-40167. It includes CI configurations and insecure coding practices for SAST/dependency scanning tests.

Classification
Stub 90%
Attack Type
Other
Complexity
Trivial
Reliability
Theoretical
Target: N/A
No auth needed
Prerequisites: None
devstral-2 · analyzed Feb 23, 2026 Full analysis →
nomisec WRITEUP
by uthrasri · poc
https://github.com/uthrasri/Jetty-v9.4.31_CVE-2023-40167

This repository contains a partial snapshot of Jetty's HTTP parser code, likely intended for vulnerability analysis of CVE-2023-40167. It includes core Jetty server classes but lacks exploit code or a detailed technical breakdown of the vulnerability.

Classification
Writeup 90%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: Eclipse Jetty v9.4.31
No auth needed
Prerequisites: Access to Jetty server · Network connectivity
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (4)

Core 4

Scores

CVSS v3 5.3
EPSS 0.0457
EPSS Percentile 89.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-130
Status published
Products (6)
debian/debian_linux 10.0
debian/debian_linux 11.0
debian/debian_linux 12.0
eclipse/jetty 12.0.0 (6 CPE variants)
eclipse/jetty 9.0.0 - 9.4.52
org.eclipse.jetty/jetty-http 9.0.0 - 9.4.52Maven
Published Sep 15, 2023
Tracked Since Feb 18, 2026