Penetration Testing vs Vulnerability Scanning vs Security Testing

A vulnerability scan is an automated check for known weaknesses: cheap, fast and shallow. Application security testing is a person testing your app's own rules, such as who can see which records, against OWASP guidance. A penetration test is a scoped attack by an independent, often accredited, tester whose report auditors and enterprise buyers accept. Most products need scanning always, testing regularly and a pentest when someone requires one.

If you would rather have the testing handled for you, see how RAITHub would test this below. RAITHub does application-level security testing. It is not a CREST- or PCI-certified penetration test and produces no compliance attestation.

What is the difference between a pentest and a vulnerability scan?

A scan asks "are any known problems visible?" A pentest asks "can a skilled person get in, and how far?" NIST's technical guide to security testing draws the same line between automated discovery and testing that tries to exploit what it finds (NIST SP 800-115). PCI DSS keeps them as separate requirements: quarterly external scans by an Approved Scanning Vendor under 11.3.2, and penetration testing under 11.4, and a scan cannot close the pentest requirement (Halo Security on PCI scanning vs pentesting).

	Vulnerability scanning	Application security testing	Penetration testing
Who does it	A tool	A tester who knows the app's roles and rules	An independent tester or firm, often accredited
How often	Every build, or weekly	Per release, or monthly	Yearly and after significant changes, or when required
Finds	Missing headers, outdated libraries, known CVEs, some injection	Broken access control, tenant leaks, business-logic abuse, auth weaknesses	Chained attacks, real-world exploitability, plus much of what the other two find
Misses	Anything that needs to know who owns what	Infrastructure outside the app; it does not produce an independent opinion	Anything outside the agreed scope and time box
Output	A list of findings, many low-value	Findings with fixes, ideally as rerunnable tests	A formal report and often an attestation letter
Market price (2026)	Free (ZAP) to about $1,999 a year for commercial tiers (Astra)	Priced by tester days	$5,000–$30,000 for most web apps (Blaze)

For a full breakdown of prices and what moves them, see the web application security testing cost guide.

What does a vulnerability scanner actually find?

Known patterns. A dynamic scanner (DAST) crawls the running app and inspects responses; a dependency scanner compares your packages with advisory databases; a static scanner (SAST) reads the source for risky patterns. All three are worth running because they are cheap and they never get bored.

A scan can be as light as one command. ZAP's baseline scan spiders the target for a minute and reports passive findings without attacking it (ZAP baseline scan docs):

docker run -t ghcr.io/zaproxy/zaproxy:stable zap-baseline.py -t https://staging.example.com

Point it at a staging copy you own. The limit is structural: a scanner sees that GET /api/invoices/812 returned 200, but it does not know whether the signed-in user should be allowed to see invoice 812. That question, Broken Access Control, is A01 in the OWASP Top 10:2025.

What is application security testing, and how is it different from a pentest?

It is a person testing the application's own logic with real roles and accounts, following a method such as the OWASP Web Security Testing Guide. It overlaps heavily with the application part of a pentest. The differences are independence, scope and what the paper is worth:

• Independence. A pentest firm has no stake in the code. That is why auditors accept its report.
• Scope. A pentest may include networks, cloud configuration and social engineering. Application testing stays inside the app and its APIs.
• Output. Application testing should leave tests behind. Sundor Skin, a B2B wholesale platform RAITHub built, has a 21-case IDOR suite in CI that tries to read other buyers' data on every build (case study). A pentest leaves a report that describes the app on the days it was tested.

The two work together. Application testing between pentests catches access-control bugs when they are cheap to fix, so the pentest's paid days go on the harder problems. The OWASP Top 10 testing checklist shows what an application-level pass covers.

When do I need a certified penetration test?

When a third party must accept the result. The common triggers:

• PCI DSS. Requirement 11.4 of PCI DSS v4.0.1 calls for penetration testing at least every 12 months and after significant changes, with a documented methodology and retesting of exploitable findings (Halo Security; standard text in the PCI SSC document library). Your scope depends on how you take card payments; confirm it with your acquirer or a Qualified Security Assessor.
• SOC 2 or ISO 27001 audits. Auditors commonly expect evidence of independent testing. See what SOC 2 takes for an early-stage startup.
• Enterprise buyers. Security questionnaires often ask for the date and summary of your last third-party pentest. Some name CREST accreditation.
• Regulators and contracts. If a clause says "independent penetration test", neither your team nor your development partner can satisfy it.

In each case, hire an accredited pentest firm. RAITHub is not one, and is not SOC 2 or ISO 27001 certified. This is general information, not compliance advice; confirm your obligations with your adviser or assessor.

Which one does my product need right now?

Your situation	Scanning	App security testing	Certified pentest
Prototype with test data only	Yes, in CI	Optional	No
Launching with real user accounts	Yes	Yes, at least an access-control pass before launch	Usually not yet
Multi-tenant B2B SaaS selling to mid-size companies	Yes	Yes, every release that touches roles or data	When the first serious buyer asks
Handling card data on your own servers	Yes, plus ASV scans	Yes	Yes, required by PCI DSS
Preparing for a SOC 2 audit	Yes	Yes, to fix issues first	Usually yes

For a first security questionnaire without any certification, this guide shows how to answer honestly with the evidence you do have.

Why do scans produce so many false positives?

Because a tool cannot see context. It flags a missing header on a static asset, a library version that is vulnerable only in a function you never call, or a reflected parameter that is already encoded. Someone has to triage. The usual pattern is to run scans on every build, fail the build only on new high-severity findings, and review the rest weekly. Budget a few hours a month of developer time for triage, or the scanner turns into noise that people learn to ignore.

Buy, build or hire?

Route	Choose this when
A tool or SaaS testing platform (DAST, SAST, dependency scanning, PTaaS)	You need continuous coverage of known issues and have someone to triage findings.
Freelancers or crowdtesting (independent testers, bug bounty)	Your app is public and mature, and you can manage a stream of reports.
An in-house QA or security hire	Security testing is a full-time workload for you.
A managed QAaaS team	You want application-level testing with real roles, written as tests in your CI, without hiring. Not a certified pentest.
A certified pentest firm	A standard, auditor, regulator or buyer requires an independent report.

Why RAITHub for this

• The middle layer done properly. Access-control, tenant-isolation and logic testing is where scanners stop and where RAITHub's own platforms are tested hardest.
• Tests you keep. Confirmed findings come back with fixes and regression tests, so a bug does not return after the pentest.
• Straight answers on limits. RAITHub will tell you when only a certified pentest will do.

When you don't need RAITHub

• You need a pentest report or attestation. Go to an accredited firm directly.
• You only need a scanner set up in CI and have a developer to triage it.
• You want testers placed under your management. RAITHub does not offer staff augmentation.

How RAITHub would test this

• Baseline: scanners and dependency audits wired into your CI, with a triage rule so only new high-severity findings block a build.
• Application testing: an OWASP-guided pass with real roles, focused on access control, tenant isolation, authentication and business logic.
• Regression tests: confirmed findings turned into automated API tests.
• Pentest readiness: a scope document and fixed findings, so a certified pentest firm can start on harder ground.

Buy it as a fixed-price one-off security audit, a monthly QA plan, or a dedicated QA team RAITHub manages and bills monthly. You receive the findings, the tests in your repository and full IP under NDA. See security testing and QA as a service. Next step: book the free 15-minute technical audit, then get a written fixed quote.

Last reviewed: 7 October 2026.

Frequently asked questions

Is a vulnerability scan a penetration test?

No. A scan is automated and reports known, visible weaknesses. A penetration test is a person trying to exploit weaknesses within an agreed scope. PCI DSS lists them as separate requirements, and scan output does not satisfy the pentest requirement.

How often should I run vulnerability scans?

On every build if you can, and at least weekly for anything public. PCI DSS requires external scans by an Approved Scanning Vendor at least every three months for in-scope systems.

How often do I need a penetration test?

When a standard or buyer requires it, commonly at least yearly and after significant changes. PCI DSS sets that cadence for in-scope systems. Without such a requirement, many teams book one before their first enterprise deal.

Can application security testing replace a pentest?

Not where an independent report is required. It covers much of the same application ground and leaves tests behind, but it does not give an independent opinion or attestation. Use both where a pentest is mandatory.

What is PTaaS?

Pentest as a service: a subscription that combines continuous scanning with periodic manual testing and a findings dashboard. Check how much of a cheaper tier is manual work before treating it as a full pentest.

Does RAITHub provide penetration testing?

No. RAITHub provides application-level security testing against OWASP guidance. It is not a CREST- or PCI-certified pentest and gives no compliance attestation. RAITHub can prepare your app for a pentest by an accredited firm.