The Hyperion FTP Server v2.8.11 and below for Windows 95/98/NT/2000 contains a buffer overflow in ftpservx.dll which allows remote code execution.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/30638/hyperion.2.8.11.txt
Source: https://packetstormsecurity.com/files/30638/hyperion.2.8.11.txt.html