Default passwords, a few common passwords, and blank/absent passwords on some system accounts.Denials of service (Dos) vulnerabilities.Vulnerabilities that could allow unauthorized control or access to sensitive data on a system.Nessus can scan these vulnerabilities and exposures: You can download current version of Nessus in here. Nessus works by testing each port on a computer, determining what service it is running, and then testing this service to make sure there are no vulnerabilities in it that could be used by a hacker to carry out a malicious attack. Nessus is a tool that checks computers to find vulnerabilities that hackers COULD exploit. In fact, Nessus is one of the many vulnerability scanners used during vulnerability assessments and penetration testing engagements, including malicious attacks. Nessus is an open-source network vulnerability scanner that uses the Common Vulnerabilities and Exposures architecture for easy cross-linking between compliant security tools. Tenable also contains what was previously known as Nessus Cloud, which used to be Tenable’s Software-as-a-Service solution. Tenable.io is a subscription-based service. Nessus is a proprietary vulnerability scanner developed by Tenable, Inc.

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