The Vonage Motorola Phone Adapter VT 2142-VD does not properly verify that a SIP INVITE message originated from a legitimate server, which allows remote attackers to send spoofed INVITE messages, as demonstrated by a flood of messages triggering a denial of service, and by phone calls with malicious content.

The Vonage Motorola Phone Adapter VT 2142-VD does not encrypt RTP packets, which might allow remote attackers to eavesdrop by sniffing the network and reconstructing the RTP session.