A vulnerability in the Mitel 6800 Series, 6900 Series, and 6900w Series SIP Phones, including the 6970 Conference Unit, through R6.4.0.HF1 (R6.4.0.136) could allow an unauthenticated attacker with physical access to the phone to conduct an argument injection attack, due to insufficient parameter sanitization. A successful exploit could allow an attacker to execute arbitrary commands within the context of the system.