CVE-2026-31847

Hidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement of a Telnet service. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.

Hidden functionality in the /goform/setSysTools endpoint in Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 allows remote enablement of a Telnet service. By sending a crafted POST request with parameters such as telnetManageEn=true and telnetPwd, an authenticated attacker can activate a Telnet service on port 23. This exposes a privileged diagnostic interface that is not intended for external access and can be used to interact with the underlying system.

Funcionalidad oculta en el endpoint /goform/setSysTools en el firmware de Nexxt Solutions Nebula 300+ hasta la versión 12.01.01.37 permite la habilitación remota de un servicio Telnet. Una vez habilitado, el servicio expone una interfaz de gestión de diagnóstico privilegiada a través de la red, aumentando la superficie de ataque y permitiendo un compromiso adicional del dispositivo.