Find and Fix Vulnerabilities — Fast, Accurate, Trusted
Automated scanning, clear prioritization, and comprehensive coverage across your IT and cloud assets.
Start free and see why security teams trust Nessus.
Comprehensive Vulnerability Assessment
Comprehensive Vulnerability Scanning
Identify flaws, misconfigurations, and missing patches with fast, accurate scanning across your entire environment.
450+ Pre-Configured Templates
Launch scans instantly with templates for servers, databases, web applications, and compliance frameworks.
Advanced Risk Scoring
Prioritize what matters with CVSS v4, EPSS, and VPR scoring to focus on the most critical vulnerabilities.
Live Results & Real-Time Updates
Get continuous visibility as plugins update, with live results that show vulnerabilities as soon as they're discovered.
Multi-Platform & Portability
Deploy on Windows, macOS, Linux, and even Raspberry Pi for maximum flexibility across your environment.
Web App & External Attack Surface
Expert edition adds DAST, IaC checks, and external attack surface management for up to 5 domains.
Why Security Teams Trust Nessus
Eliminate Blind Spots
Gain full visibility across your IT infrastructure, cloud environments, and web applications to identify vulnerabilities before attackers do.
Prioritize & Fix What Matters
Focus remediation efforts on the most critical vulnerabilities using CVSS, EPSS, and VPR scoring to maximize security ROI.
Accelerate Compliance & Reduce Workload
Automate security assessments and generate ready-to-use reports for compliance frameworks like PCI DSS, HIPAA, and NIST.
Trusted Accuracy & Scale
With six-sigma accuracy, daily plugin updates, and over 2 million users worldwide, Nessus delivers reliable results at any scale.
Trusted by Security Professionals Worldwide
"Nessus enables us to detect and resolve vulnerabilities before they reach production, saving countless hours of manual review and reducing our risk exposure significantly."
"By embedding Nessus into our cloud architecture, we achieved complete visibility across our hybrid environment and reduced our mean time to remediation by 65%."
"Nessus consistently delivers the most reliable results across complex networks. Its accuracy and comprehensive coverage make it indispensable to our security practice."
Nessus Professional—
Built for security professionals like you
Get the world's most widely deployed vulnerability assessment solution.
Try for freeBuy Nessus Pro
Buy a multi-year license and save. Add Advanced Support for access to phone, community and chat support 24 hours a day, 365 days a year.
Select your license
Buy a multi-year license and save.
Add support and training
24x365 Access to phone, email, community, and chat support. More info.
1 Year Access to the Nessus Fundamentals On-Demand Video Course for 1 person. More info.
Buy nowFrequently Asked Questions
Yes, you can start a free trial of Nessus Professional or Expert. The trial gives you full access to all features for 7 days. You can upgrade to a paid license at any time during or after the trial.
Essentials is free and limited to 16 IPs. Professional offers unlimited IT vulnerability scans. Expert adds web application scanning, infrastructure as code checks, and external attack surface management for up to 5 domains.
Nessus supports all major Linux distributions, FreeBSD, macOS, and Windows. Check the System Requirements for specific version compatibility.