Tenable
Vulnerability management, Nessus and exposure management for enterprise security
- 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 in the world — along with 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 tricky: IoT devices, container instances, and ephemeral cloud workloads can quickly cause the asset count to rise. Organisations that don’t actively manage their asset inventory often see their Tenable bill increase year after year without the security level improving.
Procurement considerations
- Scrub 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 duplicate counts. In practice, 10-20% of assets can be cleaned up — with an immediate impact on the license cost.
- 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) offer substantial discounts and protect against mid-term price increases. For a mature security programme where Tenable is structurally part 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). When seriously comparing these alternatives in a renewal process, negotiation space emerges. An independent procurement partner can explore this beforehand without reputational risk.
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 select the EU instance and contractually document 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: leaking this data is a blueprint for attackers. Role-based access and audit logging must be actively configured — this is not 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 license invoice, while delivering 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, reporting, and multi-user collaboration. For an enterprise security programme, the platform is almost always necessary.
Do I need Tenable One or are standalone products sufficient?
Tenable One is an exposure management platform that bundles vulnerability management, cloud security, identity exposure, and attack surface management. For large organisations with multiple Tenable products, it offers a bundle price and a single central dashboard — but only interesting if you actually use those modules.
How exactly 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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