This indicates an attack attempt to exploit an Authentication Bypass Vulnerability in Intelbras WRN 150 devices.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted HTTP request. A remote attacker may be able to exploit this to access the service without credentials.
Roteador Wireless Intelbras WRN 150 devices
Security Bypass: Remote attackers can bypass security checks of vulnerable systems.
Currently, we are unaware of any vendor supplied patch for this issue.