Founded in 2002, Tenable Network Security provides continuous network monitoring to identify vulnerabilities, reduce risk and ensure compliance. Tenable Network Security cooperated with SYSTEX Corporation, and celebrated for their product "Nessus".

Nessus is a proprietary comprehensive [clarification needed] vulnerability scanner. It is free of charge for personal use in a non-enterprise environment. Tenable ordered Snap Cup in SourceEC to let more people know Nessus. They designed the snap cup in three kinds of blue color as the color of their logo, and then printed the logo on it. It is bright.