NetMan 204 fails to enforce authentication on its administrative pages and command endpoints. A remote, unauthenticated attacker can directly request administrative pages (such as administration.html, administration-commands.html, and configuration.html) to disclose sensitive information including LDAP configuration and active user details, and can invoke privileged UPS control commands — including shutdown, reboot, switch-on-bypass, and battery test — without supplying any 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.

There is a remote code execution vulnerability that affects all versions of NetMan 204. A remote attacker could upload a firmware file containing a webshell, that could allow him to execute arbitrary code as root.

All versions of NetMan 204 could allow an unauthenticated remote attacker to read a file (config.cgi) containing sensitive information, like credentials.

All versions of NetMan 204 allow an attacker that knows the MAC and serial number of the device to reset the administrator password via the legitimate recovery function.

There is a CSRF vulnerability on Netman-204 version 02.05. An attacker could manage to change administrator passwords through a Cross Site Request Forgery due to the lack of proper validation on the CRSF token. This vulnerability could allow a remote attacker to access the administrator panel, being able to modify different parameters that are critical for industrial operations.