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Cybersecurity · Testing

Vulnerability scan or penetration test: which one are you being asked for?

A scan finds known weaknesses automatically. A penetration test has a person try to break in. Here is when you need each and what drives the price.

Scan finds, pen test proves

Who asks for which

What drives the cost

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The short answer

A vulnerability scan is an automated check that compares your systems against a database of known weaknesses, such as missing patches, outdated software and risky settings. It is fast, repeatable and run often, usually monthly or quarterly. A penetration test is a time-boxed exercise in which a skilled tester tries to actually break in, chaining weaknesses together the way an attacker would, and reports what they reached.

Put simply, a scan tells you what might be wrong. A penetration test shows what an attacker could do with it. Most businesses need regular scans all year and a penetration test once a year or after big changes. If an insurer, client or regulator is asking, read the exact wording: it usually tells you which one they mean.

Side by side

Vulnerability scan

Automated tool. Broad coverage of every reachable device. Finds known issues with a severity score. Run monthly or quarterly. Some false positives. Lower cost and often part of a managed security service.

Penetration test

Human-led, with tools. Goes deep on a defined scope. Proves which weaknesses can be exploited and how far an attacker gets. Run yearly or after major changes. Higher cost, priced per engagement.

NIST’s technical guide to security testing, SP 800-115, describes the same split: scanning identifies hosts, services and known vulnerabilities, while penetration testing confirms whether those vulnerabilities can be exploited and what the impact would be. The two are complements, not substitutes. A pen test without regular scanning leaves you blind for the other 51 weeks of the year. Scanning without ever testing leaves you guessing which findings really matter.

Internal, external and authenticated scans

Scans come in a few flavors, and requests from clients often name one specifically.

  • External scan. Run from the internet against your public IP addresses, website, firewall and remote access portals. This is what an attacker sees first.
  • Internal scan. Run from inside your network against computers, servers, printers and network gear. It finds the weaknesses an attacker would use after a phishing email lands.
  • Authenticated scan. The scanner logs in with credentials, so it can see installed software and missing patches instead of guessing from the outside. It produces far more accurate results.
  • Web application scan. Tests a website or portal for flaws such as injection and broken authentication.

For a small business, the useful baseline is a monthly authenticated internal scan plus an external scan, with findings fed into your patching routine. CISA also offers a free external vulnerability scanning service to qualifying organizations, which is worth checking if budget is tight.

Which one is your insurer, client or regulator asking for?

Most requests fall into a few patterns. Match the wording before you buy anything.

  • Cyber-insurance applications. Many ask whether you scan for vulnerabilities and how quickly you patch critical findings. Some larger policies ask about penetration testing. Answer exactly what is asked, and confirm with your broker or insurer what evidence they expect.
  • Card payments (PCI DSS). PCI DSS requires quarterly external scans by an Approved Scanning Vendor for merchants whose systems are in scope, plus internal scans, and requires penetration testing for organizations completing the fuller assessments. Your payment processor tells you which questionnaire applies.
  • FTC Safeguards Rule. Covered financial businesses such as tax preparers and mortgage brokers must either run continuous monitoring or do an annual penetration test plus vulnerability assessments every six months, according to the FTC’s business guidance. Small institutions with fewer than 5,000 consumers are exempt from parts of this.
  • Enterprise client security questionnaires. These often ask for an annual third-party penetration test report or a summary letter. Ask whether a summary is enough, since full reports contain sensitive detail.
  • CMMC and defense work. NIST SP 800-171 requires periodic vulnerability scanning; penetration testing is not one of the 110 Level 2 requirements, although some primes ask for it.

If the request just says “security testing”, ask which of the two they mean, how recent it must be and what proof they want. That one email can save thousands.

Not sure which testing you actually need? Our free Technology Health Assessment takes about 30 minutes of data collection. The next day you get a plain-language report rating your IT operations, cybersecurity, backups and business continuity as controlled, needs attention, significant exposure or unknown, with a short list of next steps in order. It is yours to keep, with no obligation. Book your assessment.

What drives the cost

We do not publish prices for testing, and market quotes vary widely. These are the factors that move the number.

Vulnerability scanning

  • Number of IP addresses, devices and websites in scope
  • Whether scans are authenticated
  • How often scans run
  • Whether someone reviews results and removes false positives, or you just get a raw report
  • Whether remediation (actually fixing things) is included

Penetration testing

  • Scope. External only, internal network, web application, wireless, cloud or a combination. Each adds days.
  • Size. Number of IP addresses, applications, user roles and locations.
  • Approach. Black box (no information given) takes longer than gray box (some credentials and diagrams).
  • Social engineering. Phishing tests or phone pretexting are usually separate line items.
  • Retesting. Whether a retest after you fix findings is included.
  • Report format. Some clients require an attestation letter in addition to the technical report.

How to buy a penetration test without wasting it

  1. Fix the obvious first. Run scans and patch critical findings before the test. Paying a tester to tell you about a missing patch a scan would have found is expensive.
  2. Write the scope down. List IP ranges, applications, test dates and what is off limits. Get written authorization signed by someone who owns the systems.
  3. Ask for a sample report. Good reports explain each finding, show evidence, rate risk in business terms and give specific fixes.
  4. Ask who does the work. Confirm the tester’s experience and whether any work is subcontracted.
  5. Tell your IT provider and insurer. Testing can trigger alerts. Your IT team should know the window.
  6. Plan the fix-and-retest cycle. Budget time to remediate and confirm the fixes held.

A sensible testing rhythm for a 25 to 100 person business

  • Monthly authenticated internal scans and external scans, reviewed by a person
  • Critical and high findings patched on a defined clock, for example within 14 to 30 days, or sooner if your insurer or a client specifies a shorter window
  • Annual external penetration test, plus internal or web app testing if you hold sensitive data or clients ask
  • A retest after major changes such as a new office, a cloud migration or a new customer portal
  • Results summarized for leadership once a year

Testing only helps if someone acts on it. Our cybersecurity services cover the work that makes test results look better: updates, endpoint protection, multi-factor authentication, email security and monitored backups with tested restores. If your insurer is the one asking, our guide to cyber insurance requirements covers what applications typically ask.

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Questions we hear

Is a vulnerability scan the same as a penetration test?

No. A vulnerability scan is automated and lists known weaknesses. A penetration test is led by a person who tries to exploit weaknesses and shows how far an attacker could get. Most businesses need both, on different schedules.

How often should a small business run vulnerability scans?

Monthly is a practical baseline for internal and external scans, with critical findings patched quickly. Some rules set a minimum, such as quarterly external scans for PCI DSS or every six months under the FTC Safeguards Rule.

How often do you need a penetration test?

Typically once a year and after significant changes to your network or applications. Check the exact wording of any insurer, client or regulatory requirement, since some name a specific frequency.

Does cyber insurance require a penetration test?

Requirements vary by carrier and policy size. Many applications ask about vulnerability scanning and patching; fewer require penetration testing. This is general information, so confirm with your broker or insurer.

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