A hidden backdoor on PATLITE NH-FB Series devices with firmware version 1.45 or earlier, NH-FV Series devices with firmware version 1.10 or earlier, and NBM Series devices with firmware version 1.09 or earlier allow attackers to enable an SSH daemon via the "kankichi" or "kamiyo4" password to the _secret1.htm URI. Subsequently, the default password of root for the root account allows an attacker to conduct remote code execution and as a result take over the system.

On Patlite NH-FB series devices through 1.46, remote attackers can cause a denial of service by omitting the query string. NOTE: the vendor's perspective is that "omitting the query string does not cause a denial of service and the indicated event can not be reproduced.

Patlite NH-FB v1.46 and below was discovered to contain insufficient firmware validation during the upgrade firmware file upload process. This vulnerability allows authenticated attackers to create and upload their own custom-built firmware and inject malicious code. NOTE: the vendor's position is that this is a design choice, not a vulnerability