An issue was discovered on certain Nuki Home Solutions devices. An attacker with physical access to this JTAG port may be able to connect to the device and bypass both hardware and software security protections. This affects Nuki Keypad before 1.9.2 and Nuki Fob before 1.8.1.
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.