Tenable

Definition

Tenable is a cybersecurity company specializing in exposure and vulnerability management, best known for creating Nessus and for its cloud platform Tenable One, which unifies vulnerability, cloud, identity, and attack surface data into a single risk view.

Overview

Tenable's roots trace back to Nessus, the vulnerability scanner it created, which remains one of the most widely deployed scanning tools in the industry. Building on that foundation, Tenable expanded into Tenable.io and later Tenable One, cloud platforms that aggregate vulnerability data across IT, cloud, operational technology (OT), and identity systems into a single, prioritized view of organizational risk exposure. Tenable popularized the term "exposure management" to describe this shift from siloed vulnerability lists toward a unified, risk-prioritized view of an organization's entire attack surface — correlating asset criticality, vulnerability severity, and real-world exploitability so security teams can focus on the issues that matter most rather than treating every finding as equally urgent. Competing directly with Qualys and Rapid7, Tenable differentiates itself through its exposure management framing and its long-standing credibility from Nessus, along with dedicated products for OT/industrial control system security and identity exposure.

Key Features

• Creator and maintainer of the widely used Nessus vulnerability scanner
• Tenable One platform unifying IT, cloud, OT, and identity risk data
• Exposure management approach prioritizing risk over raw vulnerability counts
• Operational technology (OT) and industrial control system security coverage
• Attack path analysis showing how vulnerabilities could be chained together
• Cloud security posture management capabilities
• Risk-based vulnerability prioritization using exploitability data

Use Cases

Frequently Asked Questions

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