25+ Years of Experience
Fixed Service Pricing
24/7 Monitoring
2500+ Fully Managed Users
25+ Years of Experience
Fixed Service Pricing
24/7 Monitoring
2500+ Fully Managed Users
Identify and fix exploitable security weaknesses before attackers do. Our automated penetration testing, powered by Vonahi’s CREST-certified vPenTest platform, delivers real-world attack simulation with expert-reviewed results at a far lower cost than traditional manual testing.
Why businesses choose our penetration testing services:
Penetration testing for businesses simulates real-world cyberattacks to expose vulnerabilities before criminals can exploit them. Our core service uses Vonahi’s CREST-accredited automated penetration testing platform, giving you broad and reliable testing coverage at a fraction of the cost of traditional manual testing.
Our pen testing services follow a proven process:
At Nexus, all testing is carried out by specialists who act as ethical hackers, safely replicating real-world threats to improve your security posture. For organisations requiring deeper, bespoke manual assessments, we also partner with CSA Cyber to deliver human-led penetration testing.
Our approach helps you:
Pair your regular pen testing with ongoing Vulnerability Scanning to maintain visibility between assessments.
Cyber threats evolve constantly, and so should your defences. Regular, managed pen testing for businesses ensures your controls remain effective, compliant, and resilient, month after month..
Penetration testing for businesses can be carried out using a range of methods designed to replicate different types of real-world cyberattacks. Our primary approach is automated penetration testing, supported by optional human-led testing where required.
Many organisations combine these options with Managed Security Operations Centre (MSOC) monitoring for real-time threat detection and response.
There are also different types of managed penetration testing designed to simulate various levels of attacker knowledge:
Performed with full access credentials and network details, ideal for assessing internal threats or employee-level risks.
Performed by CSA Cyber, this approach gives the tester partial knowledge of your environment, simulating an attacker with limited insider information.
Conducted with no prior access or information, emulating an external hacker starting from scratch.
A well-planned combination of these pen testing services gives decision-makers a complete view of security performance. It helps prioritise remediation, meet compliance obligations, and strengthen overall resilience against evolving threats. You can extend this protection further with Business Continuity and Disaster Recovery (BCDR) planning to keep systems operational after an incident.
Our managed penetration testing process is designed to give you a complete, evidence-based understanding of your security posture. Each phase is led by experienced consultants using industry-recognised tools and ethical hacking techniques to deliver clear, actionable insights.
Every project begins with a detailed planning and scoping phase. Here, we define your penetration testing objectives, identify which systems, applications, or networks will be tested, and determine the appropriate type of pen testing (black box, white box, or grey box). That ensures testing aligns with your compliance needs and business goals.
The automated platform performs reconnaissance to uncover system configurations, exposed assets, and potential entry points, guiding the testing methodology and risk evaluation process.
During the vulnerability analysis stage, vPenTest uses advanced automated tools, such as Burp Suite, Qualys, and OpenVAS, to detect weaknesses like outdated software, insecure configurations, or unpatched systems. This forms the foundation for accurate, risk-based testing. Findings from our pen testing often inform Secure Data Backup and Recovery strategies to minimise data loss risk.
The automated platform validates whether identified vulnerabilities can be exploited. Our consultants then review these results to help you understand real-world risk without the disruption associated with manual exploitation attempts. Where required, deeper manual validation can be arranged through CSA Cyber.
After successful exploitation, our consultants conduct post-test impact analysis. This phase evaluates the potential business consequences, from data breaches and privilege escalation to service disruption, so you can prioritise remediation effectively.
Finally, we deliver a detailed penetration testing report outlining every vulnerability, the techniques used to uncover them, and their severity levels. Each report includes prioritised, plain-English recommendations for remediation, helping you strengthen defences and maintain compliance with security standards. We can also help implement fixes through our Managed Cyber Security and Cyber Essentials Support Services.
Have questions about how pen testing works, what it costs, or how it helps your business stay secure? We’ve answered some of the most common ones below.
Most UK businesses should conduct managed penetration testing at least once a year, or after major infrastructure changes, such as system migrations, software updates, or new integrations. Regulated industries, such as finance, healthcare, or government, may require more frequent or managed pen testing for continuous security assurance. Automated pen testing makes regular assessments affordable and easy to repeat.
We provide a full range of penetration testing services, including internal, external, web application, API, and cloud testing. Each engagement is tailored to your business’s size, risk level, and compliance requirements. We provide automated penetration testing via Vonahi’s vPenTest platform, as well as human-led testing through our partner CSA Cyber when deeper manual analysis is required.
A vulnerability scan is an external scan of an environment and detects known weaknesses, while a penetration test uses ethical hacking methods to actively exploit and validate those vulnerabilities. Pen testing delivers deeper insight into how attackers could compromise your systems. Our automated platform performs both discovery and exploitation validation for a more complete assessment.
Automated tests run significantly faster than traditional manual engagements. A typical automated pen test can be completed quickly, with reports delivered shortly after. Timeframes always vary depending on the scope and complexity of your environment. A small web app test may take a few days, while full-scale infrastructure assessments can run for several weeks. We’ll confirm your timeline during the planning and scoping phase.
No. All testing is controlled, authorised, and designed to avoid disruption. Our team coordinates with your IT staff to ensure safe execution within defined windows.
We use Vonahi’s CREST-certified automated penetration testing platform. Manual pen testing via CSA Cyber also follows recognised frameworks, including ISO 27001, NIST, and OWASP.
Pricing depends on factors such as network size and required testing depth. We’ll provide a transparent quote after scoping, so you know exactly what’s included in your penetration testing service. Automated penetration testing is significantly more cost-effective than traditional human-led testing. Pricing depends on the size and scope of your environment.
You’ll receive a detailed report outlining every vulnerability, its risk rating, and actionable remediation steps. Our consultants will walk you through each finding, prioritising fixes by severity and business impact.
Yes. Automated retesting allows quick, low-cost verification to ensure vulnerabilities have been resolved.
Absolutely. Regular automated testing supports key regulations, including GDPR, ISO 27001, and PCI-DSS, demonstrating due diligence and protecting your organisation against penalties and data breaches.
Yes. We offer industry-specific automated pen testing for sectors such as finance, healthcare, education, manufacturing, and public services. Each engagement accounts for your sector’s compliance needs, data sensitivity, and threat landscape. Manual pen testing is available for organisations with bespoke or advanced needs.
Every business is different and so are its IT challenges.
Whether you’re exploring how to improve cybersecurity, strengthen backup and continuity, or get more from your Microsoft 365 environment, we’ll help you identify where to start.
Our consultants will take the time to understand your setup and share clear, practical recommendations — no jargon, no hard sell.
Simply complete the form and we’ll be in touch within 24 hours.
(Most suitable for organisations with 40+ IT users.)
“Nexus Open Systems Ltd demonstrated an excellent track record delivering innovative IT services and cloud solutions while exceeding customer expectations.”
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