---
id: CVE-2025-71317
title: >-
  NetMan 204 contains a hard-coded backdoor account with the username and
  password 'eurek' that grants administrative access
summary: >-
  NetMan 204 contains a hard-coded backdoor account with the username and
  password 'eurek' that grants administrative access. A remote, unauthenticated
  attacker can authenticate through the cgi-bin/login.cgi endpoint (for example
  /cgi-bin/…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-798
published: '2026-06-05'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T21:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-71317'
references:
  - url: 'https://www.exploit-db.com/exploits/52183'
    label: disclosure@vulncheck.com
  - url: 'https://www.riello-ups.com/downloads/25-netman-204'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/netman-204-hard-coded-backdoor-credentials
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00432
epssPercentile: 0.3505
ingestedAt: '2026-09-30T21:25:07.738Z'
---

## Overview

NetMan 204 contains a hard-coded backdoor account with the username and password 'eurek' that grants administrative access. A remote, unauthenticated attacker can authenticate through the cgi-bin/login.cgi endpoint (for example /cgi-bin/login.cgi?username=eurek&password=eurek, which due to lax parameter validation can be shortened to /cgi-bin/login.cgi?username=eurek%20eurek) to obtain administrator privileges, allowing them to alter device configuration, enable the telnet/SSH services, and reset local user credentials.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.