Outsource Penetration Testing: A Practical Guide

Almost nobody runs penetration testing in house, and the ones who do are mostly banks and tech giants with security teams larger than most companies’ entire engineering org. For everyone else, outsourcing is not a compromise; it is how this work is done. The real questions are what to outsource, what to keep, and how to pick a provider without getting a rebranded scan for your money.

Why almost everyone outsources penetration testing

Three forces push nearly every organization the same direction.

Auditors require independence. SOC 2, ISO 27001, PCI DSS, and most customer due diligence processes expect the people testing your systems to be independent of the people who built and operate them. An internal team assessing its own colleagues’ code has an obvious conflict, and auditors treat it that way. A third-party report carries weight precisely because the tester has no stake in the result looking good. That independence is what a third-party penetration testing engagement delivers: an outside team, an independent report, and an attestation letter your reviewers accept. Our page on ISO 27001 penetration testing covers what that standard’s auditors look for.

Senior offensive skills are scarce. Genuinely good penetration testers, the kind who find broken access control and chain three medium findings into one critical, are rare and heavily recruited. Hiring one is hard; retaining one when they can consult, join a vendor, or chase bug bounties is harder. Most companies simply cannot compete for this talent, and a lone in-house tester also goes stale quickly without peers to learn from.

The math does not work. A senior offensive security engineer runs roughly $180k+ fully loaded, before tooling, training, and certifications. Most companies need a few weeks of testing a year. Buying three or four fixed-scope engagements costs a fraction of one salary and gets you a rotating bench of specialists (web one quarter, cloud the next) instead of one person’s skill set applied to everything.

What you cannot outsource

Outsourcing the testing does not outsource the responsibility, and two things always stay with you.

Scoping decisions. A provider can advise, but only you know which systems hold sensitive data, which application is about to be rewritten, and what your customers and auditors actually require. Handing a vendor a vague “test our stuff” produces a test of whatever was easiest to reach. Good providers force clarity here; you still have to supply the answers.

Remediation ownership. The report is the beginning of the work, not the end. Your engineers fix the findings, your leadership prioritizes the effort, and your team verifies the changes hold up over time. A provider can retest and confirm fixes, but no vendor can own your backlog. Companies that treat the report as the deliverable, file it, and move on get the same findings again next year.

In-house vs. outsourced vs. hybrid

Fully in-house makes sense at large scale: continuous testing needs, hundreds of applications, and the budget to build and retain a real red team. Even these organizations usually bring in outside firms periodically, both for independence and to check their internal team’s blind spots.

Fully outsourced is the default for startups and small and mid-sized companies, and for good reason. You get senior specialists on demand, independence your auditor accepts, and predictable cost. The trade-off is that outside testers start each engagement with less context about your systems, which good scoping and a returning provider largely solve.

Hybrid is the common pattern as companies grow: an internal security function owns scoping, triage, and remediation, runs its own scanning between engagements, and brings in an outside firm for the deep manual testing and the independent report. This keeps institutional knowledge inside while renting the scarce offensive skills. If you have even one security hire, this is probably your model.

Outsource, hire, or hybrid: a decision checklist

Answer each question, then count your answers. The column that matches most of them is usually the right model.

Question	Outsource	Hybrid	Hire
How many weeks of testing do you need a year?	A few	A few, plus triage and scanning all year	Most weeks of the year
Do you have a security hire today?	No	One or a small team	A team that can manage and retain testers
Does an auditor or customer need an independent report?	Yes	Yes	Yes, so you still buy an outside test
How many applications and environments change each quarter?	A handful	Several	Hundreds
Can you pay $180k+ for one senior tester and keep them?	No	No	Yes

Most companies land in the first two columns. Our comparison of in-house security teams vs outsourced testing goes deeper on the trade-offs. Once you have decided to outsource, the penetration testing RFP template turns this checklist into the questions you send to vendors.

How to choose a provider

The market ranges from excellent boutique firms to scan resellers with good websites, and proposals from both look surprisingly similar. The differentiators to press on: what percentage of the work is manual and who specifically performs it, whether you can name the assigned testers and see redacted examples of their past findings, whether the report evidences methodology coverage, whether retesting is included, and whether the price is fixed before signing. We wrote a full breakdown in how to choose a penetration testing company, including the ten questions to ask every vendor before you sign. If you are weighing a subscription platform against a fixed-price team, our comparison of PTaaS companies sets the main vendors side by side.

How to outsource penetration testing, step by step

The process is the same whether you buy one test or a year of them. Seven steps, in order.

1. Define the scope. List the applications, APIs, IP ranges, and cloud accounts in play, the user roles, and the reason for the test (an audit, a customer, a release). Our guide to scoping your first penetration test walks through the questions.
2. Shortlist two or three providers. Send each the same scope and the same questions. Ask for a redacted sample report, the names of the testers, and a fixed price.
3. Sign the NDA and the services agreement. The NDA comes before you share architecture details. The services agreement sets liability, data handling, and payment terms. Ours is public: read the master services agreement before the first call if you like.
4. Agree the rules of engagement. Testing windows, source IP addresses, systems to handle with care, emergency contacts, and how credentials and test data are handled. Put it in writing.
5. Let the testers work. Keep one contact available for questions and access problems. Critical findings should be escalated the day they are confirmed, not held for the report.
6. Review the report with the testers. Walk through the findings with the people who found them, agree owners, and put the fixes into your backlog with dates.
7. Fix and retest. The provider verifies each fix and reissues the report with the closed findings. That reissued report, plus the attestation letter, is what your auditor and customers should receive.

What outsourced testing costs

Legitimate manual testing is priced by scope, and for most single-target engagements the market lands somewhere in the low four figures to low five figures. Vagueness is common, though, and many firms will not tell you a number until a sales call. We publish ours: a web application test is $5,200, an external network test is $4,200, and a full cloud configuration and exploitation review is $6,800, each as a fixed price with no day rates and no overruns. A read-only cloud security assessment, without the exploitation, starts at $4,200. The full list is on our pricing page, and the price calculator adds up the tests in your scope so you can sanity-check any quote.

One rule of thumb: a real manual test consumes days of senior tester time. A “$999 penetration test” cannot pay for that time, so it is not buying it.

In-house vs outsourced: the cost comparison

The arithmetic is the reason most companies decide to outsource penetration testing before they finish the spreadsheet. Using only our own published prices and the fully loaded salary figure above:

	In-house	Outsourced
Annual cost	Roughly $180,000 and up for one senior tester, fully loaded, before tooling, training, and certifications	Four fixed-scope engagements a year, for example web application ($5,200), external network ($4,200), API ($4,000), and cloud ($6,800): $20,200
Skills	One person’s specialty applied to everything	A rotating bench: web one quarter, cloud the next, each by the specialist
Independence	Not accepted by most auditors or customer security reviews	Accepted by SOC 2, ISO 27001, PCI DSS assessors and enterprise buyers
Coverage gaps	Vacation, attrition, and stale skills	Scheduled windows, with validated scanning between them
Retest	Depends on workload	Included in every engagement

The in-house column only makes sense once you need testing most weeks of the year. Below that, the same budget buys several specialist engagements and the independent report your auditor wants. Our pricing page shows what each of those prices includes. Which brings us to red flags.

Red flags when outsourcing

• Rebranded scans. A tool runs, the output gets a cover page, and it is sold as a penetration test. The tell is a report full of missing patches and TLS findings with nothing about access control or business logic. Always ask for a redacted sample report before signing.
• Anonymous, offshored testers. If the firm cannot name the people testing your systems, their experience, and where they sit, you do not know who is holding credentials to your production environment. Subcontracting chains are common in this industry and rarely disclosed unless you ask.
• No retest. You will fix the findings, and someone has to verify the fixes. Firms that bill retesting separately, or skip it entirely, leave you with an open-ended report and no confirmation. Retesting should be included in the price you were quoted.
• A quote with no questions. Any firm that prices your engagement before understanding your application count, roles, and environment is guessing, and the guess gets corrected mid-engagement in their favor.
• Open-ended pricing. Day rates with an “estimate” convert scoping mistakes into your problem. Fixed scope, fixed price, in writing.

Frequently asked questions

How is our data handled when we outsource penetration testing? It should be written down before testing starts. Ask where test data and evidence are stored, who can see them, how credentials you issue are handled, and when everything is deleted after the engagement. The NDA and the services agreement should cover all four. If a vendor cannot answer in writing, keep looking.

How often should outsourced testing happen? At least once a year, and after any major change: a new application, a cloud migration, or a large release. Many frameworks set the same annual floor. Our guide to how often you should run a penetration test covers the triggers by framework.

Can our MSP or IT provider do the penetration test? Usually not, if the result has to satisfy an auditor or a customer. A provider that administers your network is testing its own configuration, and most reviewers question that. Penetration testing outsourcing works best when the tester had no hand in building or running the systems under test.

How fast can testing start? At Invadel, onboarding starts within 24 hours of a signed proposal, and testing typically begins within a week of scoping. The main thing that slows a start is missing access: test accounts, VPN details, or an approved testing window.

How Invadel structures outsourced engagements

We are the outsourced testing function for companies that do not want to build one. Every engagement is fixed scope and fixed price, agreed in writing before anything is signed. Testing is performed by our senior in-house team, never subcontracted, under NDA from the first scoping conversation. Every penetration test includes a free retest, so your fixes get verified and the final report reflects the closed findings your auditor wants to see. And onboarding starts within 24 hours of signing, because a test scheduled three months out helps nobody.

If you resell testing to your own clients, as an MSP, a consultancy or an agency, our partner program is white-label: we do the testing, and the report and deliverables carry your brand. Partner pricing is on request.

If you are ready to hand this to a team that does it every day, scope your assessment. Tell us what you need tested and we will send back a fixed-scope, fixed-price proposal, with the testers named and the retest already included.