The telnet administrator service running on port 650 on Gigaset DX600A v41.00-175 devices does not implement any lockout or throttling functionality. This situation (together with the weak password policy that forces a 4-digit password) allows remote attackers to easily obtain administrative access via brute-force attacks.

A buffer overflow vulnerability in the AT command interface of Gigaset DX600A v41.00-175 devices allows remote attackers to force a device reboot by sending relatively long AT commands.