Administrator code execution via unchecked buffer copy

A classic buffer overflow in QTS 5.1.x and QuTS hero h5.1.x allows remote authenticated users with administrator access to execute code. An undisclosed component copies attacker-controlled input into a fixed-size buffer without validating its length; QNAP has not published the affected function or request field. Exploitation requires administrator privileges and network access, and the vendor assessment reports limited integrity and availability impact rather than confidentiality loss.