The Akuvox E11 password recovery webpage can be accessed without authentication, and an attacker could download the device key file. An attacker could then use this page to reset the password back to the default.
The Akuvox E11 libvoice library provides unauthenticated access to the camera capture for image and video. This could allow an attacker to view and record image and video from the camera.
Akuvox E11 appears to be using a custom version of dropbear SSH server. This server allows an insecure option that by default is not in the official dropbear SSH server.