Improper access control vulnerability in Buffalo broadband routers (BHR-4GRV firmware Ver.1.99 and prior DWR-HP-G300NH firmware Ver.1.83 and prior HW-450HP-ZWE firmware Ver.1.99 and prior WHR-300HP firmware Ver.1.99 and prior WHR-300 firmware Ver.1.99 and prior WHR-G301N firmware Ver.1.86 and prior WHR-HP-G300N firmware Ver.1.99 and prior WHR-HP-GN firmware Ver.1.86 and prior WPL-05G300 firmware Ver.1.87 and prior WZR-450HP-CWT firmware Ver.1.99 and prior WZR-450HP-UB firmware Ver.1.99 and prior WZR-HP-AG300H firmware Ver.1.75 and prior WZR-HP-G300NH firmware Ver.1.83 and prior WZR-HP-G301NH firmware Ver.1.83 and prior WZR-HP-G302H firmware Ver.1.85 and prior WZR-HP-G450H firmware Ver.1.89 and prior WZR-300HP firmware Ver.1.99 and prior WZR-450HP firmware Ver.1.99 and prior WZR-600DHP firmware Ver.1.99 and prior WZR-D1100H firmware Ver.1.99 and prior FS-HP-G300N firmware Ver.3.32 and prior FS-600DHP firmware Ver.3.38 and prior FS-R600DHP firmware Ver.3.39 and prior and FS-G300N firmware Ver.3.13 and prior) allows remote unauthenticated attackers to bypass access restriction and to start telnet service and execute arbitrary OS commands with root privileges via unspecified vectors.