Greenbone (OpenVAS) vs Tenable Nessus
Side-by-side comparison of features, pricing, ratings, and alternatives.
Greenbone develops the OpenVAS vulnerability scanning engine, one of the most widely deployed open-source vulnerability management systems, used to discover assets and identify security weaknesses across desktops, servers, network devices, and IoT/industrial equipment before attackers can exploit them. Its enterprise feed grows continuously and includes over 100,000 vulnerability tests, with automated, schedulable scans and severity-based prioritization of findings. Greenbone offers several deployment paths: a free, open-source OpenVAS edition for self-hosting, an entry-level cloud/SaaS option (OpenVAS Basic) aimed at small businesses with a 14-day free trial, and hardware appliances or virtual-machine images for larger, on-premises enterprise deployments with GDPR-compliant data handling.
Nessus is Tenable's vulnerability assessment scanner, used to discover vulnerabilities and misconfigurations across operating systems, network devices, and applications. It covers over 117,000 CVEs through more than 319,000 detection plugins, with roughly 100 new plugins released weekly, and prioritizes findings using CVSS v4, EPSS, and Tenable's own VPR risk scoring. The product ships with 450+ pre-built policy and compliance audit templates and guided remediation workflows to help teams act on results rather than just collect them. Nessus Professional and Nessus Expert are sold as annual subscriptions, with Expert adding external attack surface scanning and expanded web application scanning.
- Free, open-source edition available for self-hosting
- Very large and continuously updated vulnerability test library
- Deployment options span free software to enterprise appliances
- On-premises option supports GDPR-sensitive environments
- Industry-standard, widely trusted scanner
- Extensive and frequently updated CVE/plugin coverage
- Multiple risk-scoring models for prioritization
- Flexible deployment including low-cost hardware
- Enterprise appliance pricing isn't published and requires contacting sales
- Self-hosted free edition demands more setup and maintenance effort
- Interface and workflow are aimed at security practitioners, not general IT staff
- Annual pricing is a significant investment for small teams
- Web app scanning is limited by FQDN count on base tier
- Requires security expertise to interpret and act on results effectively
More alternatives & similar tools
Alternatives to Greenbone (OpenVAS)
View all →Vulnerability assessment scanner that finds, prioritizes, and helps remediate security weaknesses.
Alternatives to Tenable Nessus
View all →Vulnerability management platform behind the widely used OpenVAS scanning engine, from appliance to free edition.
The Verdict
AI-generated from listing dataTenable Nessus offers a comprehensive, enterprise‑grade scanner with extensive CVE coverage and advanced risk scoring at a paid subscription, while Greenbone (OpenVAS) provides a free, open‑source option with solid scanning but requires more self‑management.
Key differences
- •Pricing model: Nessus is paid subscription; Greenbone offers a free self‑hosted edition and a paid enterprise appliance.
- •Risk prioritization: Nessus uses CVSS v4, EPSS, and Tenable VPR; Greenbone relies on severity classification only.
- •Deployment flexibility: Nessus runs as a desktop app on various hardware; Greenbone is self‑hosted on‑premises or via appliances.
- •Support: Nessus offers advanced support add‑ons and training; Greenbone provides email/partner support with no guaranteed SLA.
Pricing & value
Greenbone includes a free open‑source edition; Nessus requires a paid subscription.
Ease of use / learning curve
Nessus offers guided remediation workflows and documentation, reducing expertise needed versus Greenbone's self‑hosted setup.
Features & depth
Nessus covers 117,000+ CVEs with 319,000 plugins and multiple risk scores; Greenbone’s library size not quantified.
Integrations & ecosystem
Nessus provides an API and advanced support add‑ons; Greenbone lists only email/partner support, no integration details.
Collaboration
Nessus includes policy templates and remediation workflows designed for team use; Greenbone lacks described collaboration features.
Scalability
Nessus can run on small devices like Raspberry Pi and scale to enterprise; Greenbone requires self‑hosting or appliance purchase.
Support
Nessus offers advanced support add‑on, training, and documentation; Greenbone only provides email/partner support.
Choose Greenbone (OpenVAS) if…
Organizations with limited budget that can manage self‑hosting and prefer open‑source tools.
Choose Tenable Nessus if…
Enterprises or midsize teams needing robust coverage, risk scoring, and dedicated support.
Common questions
What are the cost differences?
Nessus requires a paid subscription; Greenbone offers a free self‑hosted edition and a paid enterprise appliance with undisclosed pricing.
Which tool provides more advanced risk prioritization?
Nessus uses CVSS v4, EPSS, and Tenable VPR scoring; Greenbone classifies findings by severity only.
How much effort is needed to set up and maintain each solution?
Nessus is a desktop app with guided workflows; Greenbone’s free edition requires self‑hosting, setup, and ongoing maintenance.