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Nessus

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description Nessus Overview

Nessus is a vulnerability scanner developed by Tenable. It identifies security weaknesses within systems and networks through simulated attacks. The tool analyzes web pages and applications for issues such as outdated software versions or misconfigured settings. Nessus is primarily used by IT professionals, system administrators, and cybersecurity teams to assess and remediate vulnerabilities across enterprise environments.

help Nessus FAQ

Is Nessus open source?

No. Nessus is a proprietary vulnerability scanner from Tenable, not an open-source project. Tenable does offer Nessus Essentials as a limited free edition for small-scale use.

What does Nessus actually scan for?

Nessus checks hosts for known vulnerabilities, missing patches, exposed services, weak configurations, and CVEs. It is commonly used against servers, network devices, cloud instances, and internal IP ranges.

How is Nessus different from Nmap?

Nmap is primarily a network discovery and port-scanning tool, while Nessus goes deeper into vulnerability checks using Tenable plugins. Security teams often use both: Nmap to map services, Nessus to assess risk.

Do companies use Nessus for compliance scans?

Yes. Nessus is often used as part of vulnerability management and compliance evidence for frameworks that require regular patch and exposure checks, such as PCI DSS environments.

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