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FortiCNAPP vs Tenable Nessus comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Feb 22, 2026

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
5.8
FortiCNAPP offers significant ROI through cost-effectiveness, automation, team optimization, and compelling security enhancements without additional staffing needs.
Sentiment score
3.0
Tenable Nessus boosts security by enhancing threat visibility, reducing vulnerabilities, saving costs, and achieving high user satisfaction.
FortiCNAPP is a competitive and robust solution, the only one in the IT sphere that addresses all quadrants in the Gartner Quadrants.
Client Manager at MLL Telecom Ltd
 

Customer Service

Sentiment score
7.9
FortiCNAPP's customer service is proactive, quick, and integrates well with DevOps tools, providing satisfactory and reliable support.
Sentiment score
3.9
Tenable Nessus support is praised for responsiveness and efficiency, with mixed feedback on response times and depth for advanced queries.
My technical teams do utilize integration with DevOps tools, as it performs significantly with automation regarding sophisticated challenges.
Client Manager at MLL Telecom Ltd
Fortinet's technical support is definitely helpful and responsive.
Owner at IT CARE
Technical support from Fortinet is good; I get feedback and responses quickly.
Software Engineer at a university with 5,001-10,000 employees
We received support within one to three hours.
CIO at a insurance company with 201-500 employees
Whenever any issue arises, we contact the support, and they are always there for us.
Information security engineer at Cyberisk
The technical support is good yet could improve in terms of response time.
SOC Engineer at a outsourcing company with 10,001+ employees
 

Scalability Issues

Sentiment score
6.7
FortiCNAPP is scalable and performs well in complex environments, though some users note potential challenges under heavy traffic.
Sentiment score
5.2
Tenable Nessus is scalable and flexible for most organizations but may face limitations with very large enterprises.
For complex large customers, global deployments, or large public sector customers, the process can take longer.
Client Manager at MLL Telecom Ltd
Whether managing 50 servers today or 500 tomorrow, performance or capacity are not hindered.
SOC Engineer at a outsourcing company with 10,001+ employees
Tenable Nessus is definitely scalable, especially for license formats designed for scalability.
Security Center Coordinator at a comms service provider with 1-10 employees
 

Stability Issues

Sentiment score
7.5
FortiCNAPP is stable and reliable, despite minor lags, with strong support but needs better detection and data accuracy.
Sentiment score
5.8
Tenable Nessus is praised for stability and reliability, with high user satisfaction despite minor setup and update issues.
They respond within the service level agreements and are proactive in their approach.
Client Manager at MLL Telecom Ltd
We have not encountered any issues with missing network items or errors in API and webhook interactions.
SOC Engineer at a outsourcing company with 10,001+ employees
The stability of Tenable Nessus is extraordinary.
Founder at Cipheroot
 

Room For Improvement

FortiCNAPP requires enhanced third-party integrations, user interface improvements, better policy implementation, scalability, and FedRAMP authorization for effective use.
Tenable Nessus requires enhanced reporting, better integration, modern UI, faster scans, accurate detection, and comprehensive IT asset coverage.
The vulnerability part is not systematically organized; it is all clumsy in the web UI, and it is not user-friendly.
Software Engineer at a university with 5,001-10,000 employees
The solution could be more user-friendly and intuitive.
Client Manager at MLL Telecom Ltd
Policy implementation is quite complex, and the stability will take more time for the solutions.
Owner at IT CARE
This is Tenable's property. They want to sell Tenable Security Center, and they closed all the API capability for Tenable Nessus Professional.
Co-Founder at RSU Consultancy
An AI feature that helps them discover options without requiring them to deep dive into all features or guides them through advisory functions would be beneficial.
Freelancer And CEO at a tech vendor with 1-10 employees
The documentation is not well-organized, which can be confusing when searching for solutions or specific information related to Tenable Nessus Professional.
SOC Engineer at a outsourcing company with 10,001+ employees
 

Setup Cost

FortiCNAPP is costly but competitive, improving in affordability and flexibility, especially for early adopters despite high fees.
Tenable Nessus is valued for affordability and flexibility, though costs vary by organization size, IP count, and region.
The pricing is a mediator compared to other products; it is not that much higher and not much lower than other products, making it a very affordable price.
Owner at IT CARE
The pricing for Tenable Nessus has increased significantly, tripling over the last few years.
Security Center Coordinator at a comms service provider with 1-10 employees
Tenable Nessus's pricing is adequate if it is fully utilized.
SOC Engineer at a outsourcing company with 10,001+ employees
When we compare it to other solutions, it is more difficult for us to negotiate the price for Tenable Nessus than to negotiate the price with Rapid7.
Freelancer And CEO at a tech vendor with 1-10 employees
 

Valuable Features

FortiCNAPP enhances cloud security with compliance reports, anomaly detection, and 24/7 monitoring, offering seamless SIEM integration and vulnerability management.
Tenable Nessus excels in vulnerability detection, user-friendliness, scalability, real-time monitoring, integration, compliance reporting, and remediation advice.
It functions as a proactive tool, enabling me to identify threats quickly and automate responses.
Client Manager at MLL Telecom Ltd
The machine learning capability in Lacework FortiCNAPP is used for threat detection.
Software Engineer at a university with 5,001-10,000 employees
FortiCNAPP definitely brings time-saving benefits.
Owner at IT CARE
I mostly use the configuration audit feature for the audit configuration as a scan policy, and I will use it for credential audit, which helps me scan credentials access such as local administrator or root access, performing a deeper and more accurate check of local configuration settings and file systems, making it a highly recommended feature.
Founder at Cipheroot
The scanning and reporting features are the most valuable aspects of Tenable Nessus.
SOC Engineer at a outsourcing company with 10,001+ employees
The most valuable features of Tenable Nessus include its ease of access and quick usability.
Security Center Coordinator at a comms service provider with 1-10 employees
 

Categories and Ranking

FortiCNAPP
Ranking in Vulnerability Management
35th
Average Rating
8.4
Reviews Sentiment
6.7
Number of Reviews
13
Ranking in other categories
Container Security (28th), Cloud Workload Protection Platforms (CWPP) (17th), Cloud Security Posture Management (CSPM) (22nd), Cloud-Native Application Protection Platforms (CNAPP) (16th), Compliance Management (10th)
Tenable Nessus
Ranking in Vulnerability Management
2nd
Average Rating
8.4
Reviews Sentiment
6.0
Number of Reviews
88
Ranking in other categories
No ranking in other categories
 

Mindshare comparison

As of March 2026, in the Vulnerability Management category, the mindshare of FortiCNAPP is 1.8%, up from 1.3% compared to the previous year. The mindshare of Tenable Nessus is 5.0%, down from 10.2% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Vulnerability Management Mindshare Distribution
ProductMindshare (%)
Tenable Nessus5.0%
FortiCNAPP1.8%
Other93.2%
Vulnerability Management
 

Featured Reviews

Mark Freeborough - PeerSpot reviewer
Client Manager at MLL Telecom Ltd
Network segmentation has strengthened access control and now streamlines automated threat response
The most valuable features in FortiCNAPP include robust network segmentation and restricting access to network assets. It also supports security measures by leveraging security fabrics for better enforcement and policy enforcement. FortiCNAPP integrates with SIEM solutions, and we offer different SIEM options that work with Fortinet and AlienVault, among others, providing multiple scenarios.FortiCNAPP's automated policy recommendations significantly help improve security measures as part of an overall service wrap. When deploying a Fortinet SD-WAN or network, these tools provide greater visibility to vulnerabilities and enhanced security on the network. It functions as a proactive tool, enabling me to identify threats quickly and automate responses.
MohammedJaffir - PeerSpot reviewer
Founder at Cipheroot
Has enabled me to reduce false positives and perform deep credential auditing with seamless integrations
I mostly use the configuration audit feature for the audit configuration as a scan policy, and I will use it for credential audit, which helps me scan credentials access such as local administrator or root access, performing a deeper and more accurate check of local configuration settings and file systems, making it a highly recommended feature. Regarding integration capabilities, we can integrate Tenable Nessus with SIM tools such as Splunk, IBM QRadar, and Azure Sentinel, as well as with ticketing systems such as ServiceNow, Jira, and Slack. There is no complexity as it is very easy to integrate everything. In terms of the reporting feature, while vulnerability scanning can throw some false positives, Tenable Nessus has very few, achieving a reduction of 75% to 80% false positives with manual analysis needed. We can generate standard Nessus reports that typically include host summaries and vulnerabilities by host and plugin, alongside solutions and remediation recommendations. The main benefits I get from Tenable Nessus are complete asset inventory and comprehensive attack surface management, allowing us to prioritize vulnerabilities based on risk, focusing on true risk and threat path analysis.
report
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Top Industries

By visitors reading reviews
Financial Services Firm
11%
Computer Software Company
10%
Manufacturing Company
7%
University
6%
Manufacturing Company
10%
Financial Services Firm
10%
Government
10%
Computer Software Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business6
Midsize Enterprise4
Large Enterprise4
By reviewers
Company SizeCount
Small Business40
Midsize Enterprise19
Large Enterprise35
 

Questions from the Community

What is your experience regarding pricing and costs for Lacework?
My smaller deployments cost around 200,000 a year, which is probably not as expensive as Wiz.
What needs improvement with Lacework?
FortiCNAPP performs well in terms of threat notification and response times. However, the solution could be more user-friendly and intuitive. When managing the platform, navigating to certain detai...
What is your primary use case for Lacework?
FortiCNAPP is typically used for network access control. The standard use cases for FortiCNAPP center around reporting and automated responses, particularly in IoT environments and workflow automat...
How would you choose between Rapid7 InsightVM and Tenable Nessus?
You have full visibility across cloud, network, virtual, and containerized infrastructures with Rapid7 Insight VM. You can easily prioritize vulnerabilities using attacker analytics. Overall, Rapid...
What's the difference between Tenable Nessus and Tenable.io Vulnerability Management?
Tenable Nessus is a vulnerability assessment solution that is both easy to deploy and easy to manage. The design of the program is such that if a company should desire to handle the installation t...
What do you like most about Tenable Nessus?
We have around 500 virtual machines. Therefore, we conduct monthly scans and open tickets for our developers to address identified vulnerabilities. These scans cover the servers, other network equi...
 

Also Known As

Polygraph, FortiCNP, Lacework
No data available
 

Overview

 

Sample Customers

J.Crew, AdRoll, Snowflake, VMWare, Iterable, Pure Storage, TrueCar, NerdWallet, and more.
Bitbrains, Tesla, Just Eat, Crosskey Banking Solutions, Covenant Health, Youngstown State University
Find out what your peers are saying about FortiCNAPP vs. Tenable Nessus and other solutions. Updated: March 2026.
884,873 professionals have used our research since 2012.