A buffer overflow vulnerability in the Zyxel NBG-418N v2 firmware versions prior to V1.00(AARP.14)C0 could allow a remote unauthenticated attacker to cause DoS conditions by sending crafted packets if Telnet is enabled on a vulnerable device.
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.