Penetration test or vulnerability scan: what's the difference?

A scanner checks your servers, websites and devices for known problems: outdated software, missing patches, weak settings and exposed services. You get a list, often a long one, ranked by severity.

Scans are great at breadth and repetition. They're poor at telling which findings actually matter in your setup, and they can't spot flaws in the logic of your own application.

A penetration tester thinks like an attacker: mapping what's exposed, finding weaknesses and seeing how far each one leads, for example from a minor information leak all the way to customer data. You get a report of real, demonstrated risks with clear steps to fix them.

Pen tests catch what scanners miss: broken access control, business-logic flaws and chains of small issues that add up to a big one.

• Monthly or continuous vulnerability scanning: for any business with systems on the internet.
• A penetration test: before launching a new application, after big changes, and at least once a year.
• Both, whenever a customer, insurer or compliance framework asks for proof of security testing.

Is a vulnerability scan enough?

On its own, rarely. Scans catch known weaknesses in software and settings, but not flaws in how your own application works. Pair regular scans with a periodic penetration test.

How often should a business have a penetration test?

At least once a year, and every time you launch a new system or make a significant change to an existing one.

• Cybersecurity

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