CVE-2017-20165

LOW

debug < 3.1.0 - Inefficient Regular Expression Complexity in useColors Function

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2017-20165. PoCs published by fastify.

AI-analyzed exploit summary This repository contains a proof-of-concept for CVE-2017-20165, which involves a directory traversal vulnerability in the `@fastify/send` library. The exploit allows attackers to access files outside the intended directory root by manipulating the request path.

Description

A vulnerability classified as problematic has been found in debug-js debug up to 3.0.x. This affects the function useColors of the file src/node.js. The manipulation of the argument str leads to inefficient regular expression complexity. Upgrading to version 3.1.0 is able to address this issue. The identifier of the patch is c38a0166c266a679c8de012d4eaccec3f944e685. It is recommended to upgrade the affected component. The identifier VDB-217665 was assigned to this vulnerability.

Exploits (1)

nomisec WORKING POC 15 stars
by fastify · poc
https://github.com/fastify/send

This repository contains a proof-of-concept for CVE-2017-20165, which involves a directory traversal vulnerability in the `@fastify/send` library. The exploit allows attackers to access files outside the intended directory root by manipulating the request path.

Classification
Working Poc 90%
Attack Type
Info Leak
Complexity
Trivial
Reliability
Reliable
Target: @fastify/send library
No auth needed
Prerequisites: Access to the target server · The `@fastify/send` library being used in the application
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (5)

Core 5
Core References
Third Party Advisory, VDB Entry vdb-entry technical-description
https://vuldb.com/?id.217665
Third Party Advisory, VDB Entry signature permissions-required
https://vuldb.com/?ctiid.217665

Scores

CVSS v3 3.5
EPSS 0.0158
EPSS Percentile 82.1%
Attack Vector ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-1333
Status published
Products (2)
debug_project/debug < 2.6.9
npm/debug 3.0.0 - 3.1.0npm
Published Jan 09, 2023
Tracked Since Feb 18, 2026