Nessus is an open-source vulnerability scanner used to audit business-critical enterprise devices and applications. The "Nessus" Project was started by Renaud Deraison in 1998 to provide to the internet community "a free, powerful, up-to-date and easy to use remote security scanner." In 2002, Renaud co-founded Tenable Network Security with Ron Gula, creator of the Dragon Intrusion Detection System and Jack Huffard. Tenable Network Security is the owner, sole developer and licensor for the Nessus Open-Source Scanner source code, the Nessus trademark and the nessus.org domain worldwide.
Tenable delivers commercial enterprise network security products that perform vulnerability assessments of computer networks. Tenable offers software products which focus on three areas of security information management:
- Vulnerability Discovery and Management
- Security Event Management; and
- Executive and Technical Communication
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