(Note: Tenable.io subscription required). Nessus is the de-facto industry standard for vulnerability assessment. Trusted by more than 27,000 organizations worldwide, Nessus provides vulnerability analysis, patch confirmation, configuration assessment, and sensitive data identification for EC2 environments and instances. With a continuously updated library of more than 109,000 plugins, Nessus delivers the most in-depth coverage and accuracy to the marketplace. Nessus AMI licenses may be purchased on the Tenable Online Store.