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Vulnerability & Pen Testing

Find the weaknesses in your systems before an attacker does.

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What’s the Difference?

Vulnerability scanning checks every door and window is locked, every night. Penetration testing is hiring someone to try to break in. One keeps watch; the other proves whether it would hold.

Vulnerability Scanning

Automated checks of your computers, servers and internet-facing services against known weaknesses.

  • Finds missing updates, outdated software and risky settings
  • Checks every device
  • Runs all the time, so new weaknesses are caught quickly

Penetration Testing

We try to break in the way an attacker would, to see how far we can get.

  • Chains small weaknesses together, as real attacks do
  • Finds what a scanner can’t, such as weak passwords in use
  • Shows what an attacker could reach once inside

Side by Side

Vulnerability Scanning Penetration Testing
How it works Automated Hands-on, done in-house
How often Continuous for internet-facing systems, monthly inside your network Every 6 or 12 months, and after major changes
What it covers Every device and service, checked for known weaknesses How far an attacker could actually get
What you get Findings ranked by risk in your monthly briefing A report of what we got into, how, and what to fix first

Why You Need Both

Scanning Fills the Gaps

A penetration test is a snapshot. New weaknesses are published every day, so scanning keeps watch in the months between tests.

Testing Shows Real Risk

A scan lists what could be wrong. A test shows what an attacker could actually do with it, so you fix what matters first.

Inside and Out

We check your internet-facing systems, where attackers look first, and the computers and servers inside your network, where they go next.

Common Questions

At least once a year, and every 6 months if you hold sensitive data or your systems change often. It’s also worth testing after a major change, such as a new network, a new office or a new system facing the internet.

They block attacks as they happen. They don’t tell you what’s exposed, out of date or misconfigured, which is what attackers look for first.

Every finding is ranked by risk, so you know what to fix first. Scan results go in your monthly briefing, and each penetration test comes with its own report.

It depends on what’s in scope and how much is involved: your internet-facing systems, your internal network, websites or apps, or getting into the building itself. Every test is scoped with you and quoted before we start.

Both are extras, quoted alongside our managed IT services. See our managed IT pricing for what’s included and what’s extra.

Find Your Weak Spots First

Talk to us about vulnerability scanning and penetration testing for your business.

Got Questions?

Find quick answers to common IT support questions

How quickly can you respond to IT issues?

While many companies claim a 15-minute response, we guarantee a one-hour response time for urgent issues. This realistic timeframe allows our expert team to mobilise properly and arrive fully prepared to diagnose and resolve the problem efficiently - ensuring quality support rather than a rushed service.

How long has Sheridan Computers been established?

Sheridan Computers was established in 2001, so we've been looking after business IT for 25 years.

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IT Emergency?

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Help & Support
Standard Support Hours

Monday - Friday 8:00 - 17:00
Saturday Closed
Sunday Closed
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24/7 Emergency Support

Critical issues? Our emergency team is available 24/7 for clients with 24/7 cover.

Emergency Support Line