Tenable Holdings, Inc. is a cybersecurity company based in Columbia, Maryland, specializing in vulnerability management, exposure assessment, and cyber exposure management solutions for enterprises. Its origins trace to Nessus, an open-source vulnerability scanner developed in 1998. The company provides tools including cloud security, identity exposure protection, web app scanning, and exposure measurement, and offers platforms such as Tenable Vulnerability Management, Tenable Cloud Security, Tenable Identity Exposure, Tenable Web App Scanning, and Tenable Lumin Exposure View.