The Vonage VoIP Telephone Adapter has a default administrator username "user" and password "user," which allows remote attackers to obtain administrative access.

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.

Vonage VDV-23 115 3.2.11-0.9.40 devices have stored XSS via the NewKeyword or NewDomain field to /goform/RgParentalBasic.

On the Vonage VDV-23 115 3.2.11-0.9.40 home router, sending a long string of characters in the loginPassword and/or loginUsername field to goform/login causes the router to reboot.

An issue was discovered in Vonage Box Telephone Adapter VDV23 version VDV21-3.2.11-0.5.1, allows local attackers to bypass UART authentication controls and read/write arbitrary values to the memory of the device.