Tenable Nessus Expert

Basic Information

Tenable Nessus Expert is an advanced vulnerability assessment solution that builds upon the capabilities of Nessus Professional. It was introduced in July 2022, with specific announcements made between July 12-14, 2022. The latest stable version is Nessus 10.10.x, with updates as recent as November 7, 2025. A version 10.8.3 was released in September 2024. Tenable Nessus Expert operates under a subscription license model, available for durations such as one, three, or five years. This licensing typically includes unlimited IP scanning. However, web application scanning or external attack surface scanning beyond a certain number of domains (e.g., five per quarter) may incur additional costs. The deployment model supports standalone installation on Windows or Linux systems or management within Tenable Security Center. End of support and auto-update expiration dates are not explicitly detailed for Nessus Expert as a distinct product but are generally managed under Tenable's broader product lifecycle policies. Nessus has auto-update capabilities.

Technical Requirements

• RAM: Minimum 4 GB, with 8 GB recommended for scanning up to 50,000 hosts. For scanning more than 50,000 hosts, 8 GB minimum and 16 GB recommended. If Web Application Scanning is enabled, 16 GB RAM is recommended, ensuring Docker is configured with at least 8 GB memory if used. For Nessus Manager managing 10,001-20,000 agents, 64 GB RAM is required.
• Processor: A minimum of 4 2GHz cores is required for scanning up to 50,000 hosts. For environments scanning over 50,000 hosts, 8 2GHz cores are necessary. When Web Application Scanning is enabled, more than 8 2GHz cores are recommended.
• Storage: A minimum of 30 GB of disk space is required, not including the host operating system. An additional 5,000 MB of temporary space is recommended for the scanner to function properly. Disk space usage increases over time due to scan results, plugin updates, and logs. High-performance disks, such as SSDs or NVMe SSDs, are recommended for optimal performance, especially for virtualized hosts.
• Display: Not explicitly specified, but a modern web browser is required for the user interface.
• Ports: Specific incoming and outgoing port requirements exist for Nessus Scanner and Tenable Core, detailed in Tenable's documentation.
• Operating System: Supports various operating systems, including Windows and Linux distributions.

Analysis of Technical Requirements

Tenable Nessus Expert is a resource-intensive application, particularly concerning CPU and disk I/O. The technical requirements scale significantly with the size of the environment being scanned and the features utilized, such as Web Application Scanning. Deployments involving a large number of hosts or extensive web application scanning necessitate substantial RAM and processor capabilities to maintain performance. The recommendation for high-performance storage underscores the importance of fast read/write speeds for efficient operation.

Support & Compatibility

• Latest Version: Tenable Nessus Expert 10.10.x, with the latest update on November 7, 2025.
• OS Support: Supports a wide range of technologies, including various operating systems, network devices, hypervisors, databases, web servers, and Infrastructure as Code (IaC) repositories.
• End of Support Date: Not explicitly stated for Nessus Expert.
• Localization: The Tenable Nessus User Guide is available in English and Japanese.
• Available Drivers: Not applicable; Nessus uses a continuously updated library of plugins for vulnerability and configuration checks.

Analysis of Overall Support & Compatibility Status

Tenable Nessus Expert offers broad compatibility across diverse IT environments, covering traditional IT assets, cloud infrastructure, and code. Its support is bolstered by Tenable Research, which provides continuous updates, including over 100 new plugins weekly, ensuring coverage for the latest vulnerabilities. Advanced support is available 24/7/365 via email, portal, chat, and phone for Nessus Expert customers. The platform's ability to scan a wide array of technologies makes it a versatile tool for comprehensive vulnerability assessment.

Security Status

• Security Features: Includes External Attack Surface Discovery to identify internet-facing assets, Infrastructure as Code (IaC) Scanning with up to 500 pre-built policies for security in DevSecOps pipelines, and Dynamic Application Security Testing (DAST) for web applications. It performs comprehensive vulnerability assessments for software flaws, missing patches, malware, and misconfigurations across various systems. Compliance auditing against standards like CIS Benchmarks and cloud infrastructure (AWS, Azure, GCP, Rackspace, Salesforce) is also supported. Tenable's Vulnerability Priority Rating (VPR) helps prioritize remediation efforts based on risk.
• Known Vulnerabilities: Tenable's research team actively discovers zero-day vulnerabilities, with over 100 discovered in recent years, which contributes to the product's effectiveness in identifying threats.
• Blacklist Status: Not applicable.
• Certifications: Tenable offers various certifications related to its products, including Nessus, demonstrating expertise in vulnerability management.
• Encryption Support: As a security product, it implicitly supports encryption for secure data transmission and storage, though specific protocols are not detailed in public information.
• Authentication Methods: Not explicitly detailed in publicly available information.
• General Recommendations: Tenable Nessus Expert promotes a proactive "shift-left" security approach by integrating security into the development lifecycle and assessing IaC before deployment. Prioritizing vulnerabilities using VPR is recommended to focus on the highest risks.

Analysis on the Overall Security Rating

Tenable Nessus Expert maintains a strong security posture by offering extensive coverage for modern attack surfaces, including cloud and IaC environments. It is recognized for its high accuracy and low false positive rate (0.32 defects per 1 million scans), which enhances the efficiency of security teams. The continuous updates from Tenable Research ensure it stays current with emerging threats and vulnerabilities. Its comprehensive features for discovery, assessment, and prioritization make it a robust tool for managing cyber risk.

Performance & Benchmarks

• Benchmark Scores: Nessus boasts the industry's lowest false positive rate, measured at 0.32 defects per 1 million scans.
• Real-world Performance Metrics: Users report quick visibility of vulnerabilities and efficient automated scanning. However, scanning large environments can sometimes take 2-3 days. Tenable Agents, when dormant, consume approximately 50-60 MB of RAM, and can utilize up to 100% of available CPU during active jobs. Network utilization for uploading results averages 1.6 MB, with 99% of uploads being 5 MB or less. Scan performance is directly influenced by scanner hardware, configuration, and operating system settings, with scalability achieved through horizontal expansion.
• Power Consumption: Not explicitly detailed in available information.
• Carbon Footprint: Not explicitly detailed in available information.
• Comparison with Similar Assets: Nessus Expert is an enhanced version of Nessus Professional, offering additional capabilities for external attack surface and cloud security. Compared to open-source alternatives like OpenVAS, Nessus provides broader vulnerability coverage, a lower false positive rate, and commercial support. It is consistently ranked as a leading solution in vulnerability management.

Analysis of the Overall Performance Status

Tenable Nessus Expert delivers strong performance in vulnerability assessment, characterized by high accuracy and efficient automated scanning. While scanning large-scale environments can be time-consuming, the product's performance is scalable and can be optimized through appropriate hardware allocation and configuration. Its low false positive rate significantly reduces the manual effort required for verification, contributing to overall operational efficiency. The agent-based scanning also demonstrates efficient resource utilization.

User Reviews & Feedback

Users consistently praise Tenable Nessus Expert for its ability to provide quick visibility into vulnerabilities, its automated scanning capabilities, and frequent plugin updates that ensure comprehensive coverage. Strengths highlighted include accurate vulnerability detection, a user-friendly interface, and its effectiveness in achieving compliance, such as PCI-DSS. The platform offers comprehensive asset inventory and strong integration capabilities with SIEM and ticketing systems, along with detailed reports that include remediation recommendations. Users appreciate the low false positive rate, which streamlines remediation efforts.

However, some feedback points to weaknesses such as slow scanning times in very large environments, which can impact production. While generally low, some false positives still occur, requiring manual analysis. The user interface, while generally easy to use, has been described as outdated by some. Licensing can be perceived as complex, and there are occasional reports of slow resolution for issues related to third-party plugins.

Recommended use cases for Nessus Expert include comprehensive vulnerability assessment, compliance auditing, external attack surface management, Infrastructure as Code (IaC) scanning, and cloud security, particularly for security consultants, pen testers, and organizations adopting DevSecOps practices.

Summary

Tenable Nessus Expert is a robust and highly regarded vulnerability assessment solution designed to address the complexities of modern attack surfaces, including traditional IT, cloud environments, and Infrastructure as Code. Its key strengths lie in its comprehensive scanning capabilities, high accuracy with a low false positive rate, and continuous updates from Tenable Research, ensuring it remains effective against emerging threats. The platform's ability to discover internet-facing assets and scan IaC pre-deployment provides a proactive "shift-left" security approach, crucial for DevSecOps. User feedback generally praises its ease of use, automated scanning, and detailed reporting with actionable remediation guidance, making it a valuable tool for compliance and risk management.

However, the asset's performance in very large environments can lead to extended scan times, and some users find the licensing model complex. While the UI is functional, some perceive it as outdated. Despite these points, Nessus Expert is a leading solution in its category, offering essential features for organizations seeking to understand and reduce their cyber risk effectively.

The information provided is based on publicly available data and may vary depending on specific device configurations. For up-to-date information, please consult official manufacturer resources.