Inclusion of undocumented features or chicken bits issue exists in UD-LT1 firmware Ver.2.1.8 and earlier and UD-LT1/EX firmware Ver.2.1.8 and earlier. A remote attacker may disable the firewall function of the affected products. As a result, an arbitrary OS command may be executed and/or configuration settings of the device may be altered.

UD-LT1 firmware Ver.2.1.9 and earlier and UD-LT1/EX firmware Ver.2.1.9 and earlier allow a remote authenticated attacker with an administrative account to execute arbitrary OS commands.

Incorrect permission assignment for critical resource issue exists in UD-LT1 firmware Ver.2.1.9 and earlier and UD-LT1/EX firmware Ver.2.1.9 and earlier. If an attacker with the guest account of the affected products accesses a specific file, the information containing credentials may be obtained.