CVE-2017-1000209

MEDIUM

nv-websocket-client - Man-in-the-Middle

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 2 public exploits for CVE-2017-1000209. PoCs published by dawetmaster, andikahilmy.

AI-analyzed exploit summary This repository contains the source code of the vulnerable version of the nv-websocket-client library (CVE-2017-1000209), including detailed changelogs and implementation files. It provides technical insights into the library's structure and changes but does not include an exploit PoC.

Description

The Java WebSocket client nv-websocket-client does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL/TLS servers via an arbitrary valid certificate.

Exploits (2)

nomisec WRITEUP
by dawetmaster · poc
https://github.com/dawetmaster/CVE-2017-1000209-nv-websocket-client-vulnerable

This repository contains the source code of the vulnerable version of the nv-websocket-client library (CVE-2017-1000209), including detailed changelogs and implementation files. It provides technical insights into the library's structure and changes but does not include an exploit PoC.

Classification
Writeup 90%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: nv-websocket-client (versions up to 2.2)
No auth needed
Prerequisites: Access to the vulnerable library version
devstral-2 · analyzed Mar 14, 2026 Full analysis →
nomisec WRITEUP
by andikahilmy · poc
https://github.com/andikahilmy/CVE-2017-1000209-nv-websocket-client-vulnerable

This repository contains the source code of the vulnerable version of the nv-websocket-client library (CVE-2017-1000209), along with detailed changelog documentation. It does not include an exploit PoC but provides the vulnerable codebase for analysis.

Classification
Writeup 90%
Attack Type
Other
Complexity
Moderate
Reliability
Theoretical
Target: nv-websocket-client (versions before 2.3)
No auth needed
Prerequisites: Vulnerable version of nv-websocket-client
devstral-2 · analyzed Feb 18, 2026 Full analysis →

References (1)

Core 1
Core References
Third Party Advisory x_refsource_confirm
https://github.com/TakahikoKawasaki/nv-websocket-client/pull/107

Scores

CVSS v3 5.9
EPSS 0.0012
EPSS Percentile 31.0%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

CWE
CWE-295
Status published
Products (2)
com.neovisionaries/nv-websocket-client 0 - 2.1Maven
nv-websocket-client_project/nv-websocket-client < 2.2
Published Nov 17, 2017
Tracked Since Feb 18, 2026