The QNAP TS-239 Pro and TS-639 Pro with firmware 2.1.7 0613, 3.1.0 0627, and 3.1.1 0815 use the rand library function to generate a certain recovery key, which makes it easier for local users to determine this key via a brute-force attack.
Affected Platforms
Qnap Ts-239 ProQnap Ts-639 Pro FirmwareQnap Ts-639 ProQnap Ts-239 Pro Firmware