Penetration Testing Services
Find your vulnerabilities before attackers do
Every business has weaknesses in its technology. The question is whether you find them first or whether a cybercriminal does. Arc provides professional penetration testing services to organisations across the UK, simulating real-world cyberattacks to uncover vulnerabilities in your networks, applications, cloud environments, and remote access systems before they can be exploited.
What is penetration testing?
Penetration testing, also known as pen testing or ethical hacking, is a controlled simulation of a cyberattack on your IT systems. A certified security specialist attempts to exploit vulnerabilities in your infrastructure using the same tools and techniques that real-world attackers use, but in a safe, controlled, and legally authorised way.
The purpose is not simply to produce a list of weaknesses. It is to understand how those weaknesses could be exploited in practice, what the business impact would be if they were, and what steps you need to take to close them.
Penetration testing goes significantly further than vulnerability scanning. Where scanning identifies known weaknesses automatically, a penetration test involves human expertise, creative thinking, and active exploitation attempts that reveal the real risk to your organisation, not just a list of theoretical issues.
What we test
Arc’s penetration testing covers the full range of environments and attack surfaces that modern businesses rely on.
Network penetration testing
We test your internal and external network infrastructure for vulnerabilities in configuration, access controls, firewall rules, patch levels, and authentication. Both internal network assessments and external perimeter tests are available, giving you visibility across your entire network boundary.
Web application penetration testing
Web applications, customer portals, APIs, and bespoke software are tested against the OWASP Top 10 and beyond. We identify vulnerabilities including injection flaws, broken authentication, exposed data, insecure direct object references, and logic errors that automated scanners routinely miss.
Cloud environment testing
We assess Microsoft 365, Azure, and hybrid cloud environments for the misconfigurations, excessive permissions, and access vulnerabilities that are among the most common causes of cloud security incidents. Testing covers identity and access management, storage configuration, network security groups, and administrative controls.
Remote access and VPN testing
With hybrid working now standard across most UK businesses, the security of remote access systems is critical. We test VPN configurations, remote desktop environments, endpoint protection, and authentication controls to identify weaknesses that could allow unauthorised access to your network.
Social engineering assessments
Human error remains the most common entry point for attackers. We can conduct phishing simulations and social engineering assessments to test your team’s awareness and identify training gaps alongside technical vulnerabilities.
Why choose Arc for penetration testing?
Arc is a cybersecurity specialist with over 30 years of experience supporting UK businesses. We hold ISO 27001 and Cyber Essentials Plus certification and are a Microsoft Solutions Partner, giving us deep knowledge of the Microsoft environments that the majority of our clients depend on.
Our penetration testing is delivered by certified security specialists as part of a wider cybersecurity practice that includes managed detection and response, vulnerability scanning, email security, and firewall management. This means our testers understand your environment in context, not just as an isolated assessment exercise.
Every test is followed by a clear, actionable report written for both technical and non-technical audiences, and our team is on hand to support remediation so findings are properly addressed, not just documented.
Our numbers always add up
Numbers, as they say, never lie. Here are some that all add up to why you should be using Arc when it comes to managed IT support.
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Number of tickets
Our total number of helpdesk tickets logged across 2025
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SLA
First response met across 2025
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First-time fix rate
Number of tickets that were resolved first time across 2025
Expert insights and news
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Learn moreNews | October 15, 2026
We’re now a Microsoft Solutions Partner for Digital & App InnovationWe’re incredibly proud to share that Arc is now a Microsoft Solutions Partner for Digital & App Innovation. It’s measured by Microsoft on real customer results, and it reflects the work our…
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Learn moreNews | October 12, 2026
UK Cyber Security Statistics: What Every Business Owner Needs to Know in 2026Most UK business owners believe they are too small, too niche, or simply too unremarkable to be worth a cyber attacker’s time. The data tells a different story. The UK…
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Learn moreCloud | October 12, 2026
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