Automated testing The IRS Office of Safeguards utilizes Tenable's industry standard compliance and vulnerability assessment tool, Nessus, to evaluate the security of systems (e.g., Windows, *NIX, Cisco) that store, process, transmit or receive federal tax information. We use Nessus to conduct configuration compliance checks using Center for Internet Security (CIS) benchmarks supplemented with some IRS-specific requirements. This process has been developed to provide agencies with enhanced information regarding the security controls in place to protect FTI. Nessus audit files updates Legacy Nessus audit files ZIP The complete set of legacy Nessus audit files are also available.