Tenable
Nessus®

The first tool in your cybersecurity toolbox

Expose and close weaknesses across your constantly changing attack surface with the industry’s most trusted vulnerability assessment solution.

Try Tenable Nessus Professional free

Tenable Nessus is the most comprehensive vulnerability scanner on the market today. Fill out the form below to continue with a Nessus Pro trial.

Unlimited vulnerability assessments you can use anywhere

Download the use case
01 Discovery

Quickly identify security issues

Find flaws, missing patches, and misconfigurations across OS, devices, and apps. Use fast vulnerability scans to expose critical risk.

02 Insight

Prioritize critical cyber threats

Use built-in compliance checks, CVSS and EPSS risk scoring, and easy-to-read reports to find high-risk vulnerabilities.

03 Orchestration

Remediate with guided workflows

Get remediation guidance to close gaps faster. Streamline collaboration across IT and security to quickly reduce cyber risk.

The global gold standard in vulnerability assessment

Nessus Professional

  • Unlimited IT vulnerability assessments
  • Vulnerability scoring with CVSS v4, EPSS and VPR (for Top 10 Vulns)
  • Configuration, compliance and security audits
  • Use anywhere
  • Configurable reports
  • Community support
  • Advanced support (available as an option)
  • On-demand training (available as an option)
  • Web application scans (5 FQDNs with the option to add more)
  • External attack surface scans
Try for free Buy

Nessus Expert

  • Unlimited IT vulnerability assessments
  • Vulnerability scoring with CVSS v4, EPSS and VPR (for Top 10 Vulns)
  • Configuration, compliance and security audits
  • Use anywhere
  • Configurable reports
  • Community support
  • Advanced support (available as an option)
  • On-demand training (available as an option)
  • Web application scans (5 FQDNs with the option to add more)
  • External attack surface scans
Try for free Buy

Unlimited vulnerability assessments you can use anywhere

Download the use case
#
in accuracy
Nessus has the industry's lowest false positive rate with six-sigma accuracy.
**.32 defects per 1 million scans
Try now
#
in coverage
Nessus has the deepest and broadest vulnerability coverage in the industry.
See how
#
in adoption
Nessus is trusted by tens of thousands of organizations, with 2 million downloads worldwide.
Learn more
#
in hearts and minds
Don't just take our word for it. Security practitioners around the world put their trust in Nessus.
See more

See how Nessus compares to other solutions on the market.

Nessus is #1 for vulnerability assessment

We’ve always prioritized collaboration with the vulnerability analysts using our beloved Nessus scanner every day. For over twenty-six years, this partnership has driven continuous innovation and optimization, ensuring that Nessus remains the most accurate and comprehensive vulnerability assessment solution on the market. Our unwavering focus on community feedback guarantees we deliver the complete, high-fidelity vulnerability data you need to address critical risks.

Today, Nessus is trusted by tens of thousands of organizations worldwide. It’s one of the most widely deployed security technologies on the planet, and it powers the Tenable One Exposure Management Platform.

See for yourself - explore the product here

117 K+

CVEs

319 K+

plugins

100 +

new plugins
released weekly

Tenable’s Zero Day Research provides 24/7 updates into new and emergent vulnerabilities so you’ll always have full situational awareness.

Tenable Nessus reviews

Tenable is the only vendor to be named a Customers’ Choice in the 2025 Gartner® Peer Insights™ Voice of the Customer for Vulnerability Assessment

Read the report Explore the reviews
GPI Review CISO Insurance (except health)
GPI Review Manager of IT Security and Risk Management Banking
GPI Review Information Security & Compliance Manager Services (non-Government)
GPI Review IT Security & Risk Management Associate Manufacturing
GPI Review IT Associate Healthcare and Biotech
GPI Review Manager of IT Services Government
GPI Review Manager of IT Security and Risk Management Retail
GPI Review IT Associate Energy and Utilities
GPI Review Identity and Access Manager, Miscellaneous
Gartner and Peer Insights™ are trademarks of Gartner, Inc. and/or its affiliates. All rights reserved Gartner Peer Insights content consists of the opinions of individual end users based on their own experiences, and should not be construed as statements of fact, nor do they represent the views of Gartner or its affiliates. Gartner does not endorse any vendor, product or service depicted in this content nor makes any warranties, expressed or implied, with respect to this content, about its accuracy or completeness, including any warranties of merchantability or fitness for a particular purpose. Reviews have been edited to account for errors and readability.

Built by practitioners

Nessus is built from the ground-up with a deep understanding of how security practitioners work. Every feature in Nessus is designed to make vulnerability assessment simple, easy and intuitive. The result: less time and effort to assess, prioritize and remediate issues. Learn more about the features here.

Any platform

Deploy on Any Platform
Deploy on Any Platform

Deploy on any platform

You can deploy Nessus on a variety of platforms, including Raspberry Pi. Nessus is there with you, no matter where you are, where you're headed or how distributed your environment is.

Read the press release

Efficiency and accuracy

Efficiency and Accuracy
Efficiency and Accuracy

Efficiency and accuracy

Our dynamically compiled plugins increase scan performance and efficiency, so you can complete the first scan quickly and improve time to value.

Zero in on threats

Zero in on threats
Zero in on threats

Zero in on threats that matter most

With market-leading coverage, Nessus knows every vulnerability. The power of Nessus lets you triage and address the threats that matter most.

Pre-built policies and templates

Pre-built policies and templates
Pre-built policies and templates

Pre-built policies and templates

With more than 450 pre-configured templates, Nessus helps you quickly understand where you have vulnerabilities.

Customizable reporting & troubleshooting

Customizable reporting & troubleshooting
Customizable reporting & troubleshooting

Customizable reporting & troubleshooting

Nessus helps you optimize reports to meet your needs. Plus, you can export them in formats that work for your security process.

Live results

Live results
Live results

Live results

Nessus Live Results automatically performs offline vulnerability assessments with every plugin update. You’ll see where your vulnerabilities are based on your scan history.

Ease of use

Ease of use
Ease of use

Ease of use

Nessus takes an intuitive approach to navigation and user experience. And with our resource center, you’ll be armed with actionable tips and guidance on the next steps to take.

Grouped view

Grouped view
Grouped view

Grouped view

Nessus groups similar issues and vulnerability categories together and presents them in one thread, which simplifies researching and prioritizing issues for remediation.

Key use cases for Nessus practitioners

Nessus is the world’s No. 1 vulnerability scanning solution. Learn how Tenable customers put it to work in a range of critical situations.

Learn more
Network pen tester

Network pen testers play a unique role in the IT security ecosystem.

Before executing full breach simulations, pen testers use Nessus first to find where those major vulnerabilities are hiding.

Faculty and students

Cybersecurity students are invaluable to this highly specialized field.

Professors use Nessus with cybersecurity students in vulnerability assessment and management courses as a foundational tool to get them up to speed on the essentials of uncovering vulnerabilities.

Consultant

Cybersecurity consultants play pivotal roles in a constantly shifting threat and vulnerability landscape.

Cybersecurity consultants use Nessus to scour clients’ networks for vulnerabilities and create comprehensive reports that summarize security posture and contain key suggestions for remediation.

SMB Security admin

In years past, small and medium-sized businesses might have considered themselves effectively immune to cyberattacks.

With Nessus, even small companies that lack full-time cybersecurity staff can stay on top of vulnerabilities, customizing comprehensive scans to meet unique business needs.

To learn more about Nessus features and functionality, visit our Nessus documentation page.
To learn more about purchasing options, please contact your preferred reseller or visit our online store.

Nessus
Professional—
Built for security professionals like you

Get the world’s most widely deployed vulnerability assessment solution.

Try for free

Buy Tenable Nessus Professional

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 more.

Add support and training

Buy now
Renew an existing license
Find a reseller

Customers rely on Nessus to stay safe

Download the use case
American Eagle Outfitters image

American Eagle Outfitters

Watch video
Virtustream image

Virtustream

Watch video
World Wide Technology image

World Wide Technology

Watch video

Related resources

Check out all resources
Datasheet
Nessus Professional data sheet
FAQ
Nessus frequently asked questions
Datasheet
Nessus Expert data sheet

Related products

Tenable Security Center

Identify and prioritize vulnerabilities based on risk to your business. Managed on premises.

Request a demo Data sheet

Vulnerability Management

Unify vulnerability data to pinpoint critical exposures and speed up remediation.

Try for free Data sheet

Exposure Management Platform

Improve attack prevention with less effort.

Request demo Data sheet