Tenable
Vulnerability management & Nessus
- Security & Endpoint Protection
- Subscription
For · CISOs, security teams and IT departments at organisations with NIS2, DORA, ISO 27001 or SOC 2 obligations
Tenable is the market leader in vulnerability management and exposure management. Its best-known product is Nessus — one of the most widely used vulnerability scanners worldwide — alongside the enterprise platforms Tenable Vulnerability Management (formerly Tenable.io), Tenable Security Center and the overarching Tenable One. For organisations with NIS2, DORA or ISO 27001 obligations, a toolset like Tenable has become almost standard.
The licensing model is based on the number of assets (IP addresses, cloud resources, identities). This sounds simple, but the counting is notoriously complex: IoT devices, container instances and ephemeral cloud workloads can rapidly increase the asset count. Organisations that do not actively manage their asset inventory see their Tenable invoices rise year on year without a corresponding increase in security level.
Procurement considerations
- Clean your asset inventory before every renewal
The biggest cost saver with Tenable is a clean asset inventory. Perform a scrub just before renewal: remove old hosts, inactive cloud resources and duplicates. In practice, 10-20% of assets are usually removable — directly impacting the licence price.
- Compare standalone products with Tenable One
Tenable offers Nessus, Tenable Vulnerability Management, Cloud Security, Identity Exposure and more as standalone modules or as the Tenable One bundle. For organisations using multiple modules, the bundle price is almost always more favourable — but only if you actually use those modules.
- Negotiate a multi-year price lock
Multi-year contracts (2-3 years) provide significant discounts and protect against mid-term price increases. For a mature security programme where Tenable is a permanent component of the stack, this is often financially more attractive than renewing annually.
- Use Qualys and Rapid7 as leverage
Tenable has several strong competitors (Qualys, Rapid7, Wiz for cloud). Seriously comparing these alternatives during a renewal process creates room for negotiation. An independent procurement partner can explore this without risking reputational damage.
Compliance risks
- EU data location vs. US tenant
Tenable Vulnerability Management runs on AWS in specific regions. For organisations under NIS2 or with sector-specific data location requirements, it is mandatory to choose the EU instance and contractually secure this. This is not always the default.
- Scan data contains sensitive security intel
Tenable scan results provide detailed insights into vulnerabilities per host. This is valuable but also sensitive: leaks of this data provide a blueprint for attackers. Role-based access and audit logging must be actively configured — this is not the default.
- Ghost assets in the cloud
Cloud scanners and agents inventory ephemeral resources that appear and disappear within hours. Without proper configuration, these still count towards the licence fee despite offering little real security value. Audit this every quarter.
Frequently asked questions about Tenable
Frequently asked questions about Tenable licences and procurement.
What is the difference between Nessus Professional and Tenable Vulnerability Management?
Nessus Professional is a standalone scanner for pentesters and smaller teams. Tenable Vulnerability Management is the cloud-based platform with continuous monitoring, dashboards, reports and multi-user collaboration. For an enterprise security programme, the platform is almost always essential.
Do I need Tenable One or are standalone products sufficient?
Tenable One is an exposure management platform bundling vulnerability management, cloud security, identity exposure and attack surface management. For large organisations with multiple Tenable products, it offers a bundle price and one central dashboard — but only interesting if you actually use those modules.
Exactly how does Tenable count assets?
Tenable generally counts active assets within a measurement period. The exact definition varies per product (VM vs Cloud Security vs Identity Exposure). SoftVaro helps by thoroughly reviewing the asset definition in your contract so you don’t keep paying for “dead” assets.
Relevant knowledge base articles
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