The bug, specifically a memory corruption issue, was found to impact QNAP NAS devices running Surveillance Station versions 5.1.5.4.2 and 5.1.5.3.2, and was addressed in February this year.

Tracked as CVE-2020-2501, this security hole is a stack-based buffer overflow that could be abused by remote attackers to execute code on an affected system, without authentication.

In its advisory, QNAP credits an independent researcher for finding and reporting the flaw, but does not provide further details on the issue itself or on its exploitation.