This indicates an attack attempt to exploit a Buffer Overflow vulnerability in Novell Netware.
The vulnerability is a result of improper boundary checking when processing "DELE" FTP requests. It may allow a remote attacker to execute arbitrary code within the context of the application.
Novell Netware 5.1
Novell Netware 6
Novell Netware 6.5
Novell NetWare FTP Server prior to 5.10.02
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the patch available from the website.