Vulnerability scanning (infrastructure) · Pricing guide
Nessus Pricing, Explained
Tenable publishes Nessus prices, which makes this one of the easier budgets in security tooling to plan. Professional lists at $4,790 for a one-year licence, with multi-year discounts and an optional $400 Advanced Support add-on. The harder question is what a network vulnerability scanner does and does not cover, because that is where teams end up buying twice.
Last verified: 2026-08-14
Nessus pricing at a glance
What the Licence Covers
Nessus Professional is a scanner licence: unlimited IP addresses, unlimited assessments, the plugin feed, configuration and compliance auditing, and reporting. It is priced per licence rather than per asset, which is why it stays predictable as your estate grows and why it remains the default choice for infrastructure scanning at small and mid-size organisations.
Nessus Essentials, the free tier, is capped at 16 IP addresses. That is enough to learn the tool or scan a very small estate, and not enough for anything production-shaped.
Where the Budget Goes Next
The cost that surprises people is not the licence, it is the work. A Nessus scan of a real estate returns thousands of findings ranked by CVSS, and someone has to triage them, decide what is exploitable in context, and chase the fixes. Buyers who budget $4,790 and no analyst time typically end up with a report nobody actions.
The second cost is coverage. Nessus is built for infrastructure: missing patches, weak configurations, exposed services, known CVEs. It does not test your application's authorisation logic, and no plugin will tell you that user A can read user B's invoice, because that requires understanding what your application is for. Teams that assume a network scanner covers their web app buy the gap the hard way.
Multi-Year Maths
Three years at $13,637.54 works out to roughly $4,546 per year against $4,790 bought annually: about a 5% saving, and a three-year commitment to a tool you may want to reassess sooner. Take the multi-year price if Nessus is already load-bearing in your process; do not take it to lock in a saving that is smaller than the flexibility you are giving up.
Nessus Cost in Context (2026)
Published list prices, and what each option actually covers. The distinction that matters is infrastructure scanning versus application testing.
| Option | Published price | Covers |
|---|---|---|
| Nessus Essentials | Free (16 IPs) | Infrastructure scanning, tiny estates |
| Nessus Professional | $4,790 / year | Unlimited-IP infrastructure scanning, 1 user |
| Nessus Professional, 3 years | $13,637.54 | Same, ~$4,546 per year |
| Advanced Support add-on | +$400 | 24x365 support access |
| Penetrify | From $100/month | Web app and API penetration testing, incl. access control and business logic |
Nessus prices from tenable.com/products/nessus/nessus-professional, checked August 2026. Nessus and Penetrify are complements, not substitutes: one scans infrastructure, the other tests applications.
Different Layer, Different Tool
A vulnerability scanner answers "is anything here known to be broken?". A penetration test answers "can someone actually get in, and how far?". Nessus is a strong answer to the first question at the infrastructure layer. Penetrify answers the second at the application layer: it attacks your running web apps and APIs, tests authorisation between accounts and tenants, chains findings into real exploit paths, and runs on every deploy from $100/month. If your estate is servers, buy Nessus. If your risk is a multi-tenant application, a scanner licence will not cover it.
The bottom line
Nessus Professional at $4,790 a year is fairly priced for what it is, and the free Essentials tier is a genuine on-ramp at up to 16 IPs. Budget analyst time alongside the licence, because the licence is the cheap part. And be honest about scope: it is an infrastructure scanner, so if your crown jewels sit behind application logic, the pentest budget is a separate line item rather than something the scanner absorbs.
Frequently asked questions
How much does Nessus cost?
Tenable lists Nessus Professional at $4,790 for one year, $9,330.95 for two years and $13,637.54 for three years, with Advanced Support at an additional $400. Nessus Essentials is free for up to 16 IP addresses.
Is Nessus Essentials enough for a small company?
Only if your estate genuinely fits in 16 IP addresses. It is the same scanning engine, just capped, so it works well for learning and for a handful of hosts. Beyond that the cap becomes the constraint rather than the price.
Is the multi-year licence worth it?
Three years at $13,637.54 is about $4,546 per year, roughly 5% below the annual price. That is worth taking if Nessus is already embedded in your process, and not worth a three-year commitment if you are still deciding.
Does Nessus replace a penetration test?
No, and Tenable does not claim it does. Nessus finds known vulnerabilities and misconfigurations. A penetration test finds exploitable paths, including broken access control and business-logic flaws that no scanner signature can describe. Compliance frameworks such as PCI DSS require both.
Does Nessus test web applications?
It has web application scanning capability, but it is built around infrastructure and known-vulnerability detection. It will not test whether one tenant can read another tenant's data. For application-layer testing, use a tool built for it.