CVE-2025-71317: NetMan 204 Hard-coded Backdoor Credentials
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Remove or disable the hard-coded backdoor account with username 'eurek' to prevent its use for administrative authentication.
NetMan 204 local account 'eurek' = disabled or removed - Configuration
Disable the CGI login endpoint or restrict access to /cgi-bin/login.cgi to a trusted management network or specific IPs to prevent unauthenticated remote access.
NetMan 204 (web management) /cgi-bin/login.cgi access = disabled or restricted to trusted hosts - Configuration
Ensure telnet and SSH services are disabled unless explicitly required; if required, limit access to trusted hosts and enforce strong authentication.
NetMan 204 telnet and SSH services = disabled unless required - Compensating control
Block or restrict external access to the device management interfaces (HTTP/CGI, telnet, SSH) at the network edge or firewall; allow management only from trusted IP ranges or via an administrative VPN.
- Operational
Rotate all administrative and local user credentials, audit configuration changes, and review logs for any use of the 'eurek' account or other unauthorized activity; restore secure configurations after removal/mitigation of the backdoor.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-71317?
CVE-2025-71317 has a critical severity rating of 9.3.
How do I fix CVE-2025-71317?
To mitigate CVE-2025-71317, disable the hard-coded backdoor account and implement strong authentication measures.
What are the risks associated with CVE-2025-71317?
CVE-2025-71317 allows remote, unauthenticated attackers to gain administrative access, leading to potential data breaches.
What is the impact of CVE-2025-71317 on NetMan 204?
CVE-2025-71317 compromises the security of NetMan 204 by providing an easy entry point for attackers.
Is there a way to detect exploitation of CVE-2025-71317?
Monitoring for unusual login attempts or changes in system settings can help detect exploitation attempts related to CVE-2025-71317.