Infrastructure Penetration Testing
Attackers only need one way in. We'll help you find it before they do.
Your infrastructure is full of systems designed to protect your organisation. Penetration testing makes sure they're actually doing their job. Using manual testing and real-world attack techniques, we identify vulnerabilities, misconfigurations and security weaknesses before they become a problem.
What you don’t know can hurt you.
Why perform infrastructure testing?
Find weaknesses before attackers do
Identify vulnerabilities, misconfigurations and attack paths before they become incidents.
Validate security controls
Understand whether the controls you’ve invested in are working as intended.
Support compliance requirements
Generate independent assurance for standards such as ISO 27001, PCI DSS, NIS2, SOC 2 and other security frameworks.
Make informed decisions
Receive clear, practical remediation advice that helps technical and non-technical stakeholders understand what matters most.
Security gaps aren’t always obvious
Modern attacks rarely follow a single route. That’s why our infrastructure testing services assess both your external attack surface and the systems behind it.
External Infrastructure Testing
Your internet-facing systems are often the first thing an attacker sees. External infrastructure testing assesses the services, devices and applications exposed to the outside world, helping identify vulnerabilities before they can be exploited.
Internal Infrastructure Testing
What happens if someone gets in? Internal infrastructure testing simulates an attacker operating inside your environment, identifying opportunities for privilege escalation, lateral movement and access to sensitive systems and data.
Specialist Infrastructure Security Assessments
Sometimes the biggest risks aren’t hidden in the network itself. They’re buried within the technologies that support it.
Wireless Security Assessments
Not every attack starts with a network cable. We assess wireless infrastructure and connected devices to identify weaknesses that could provide a route into your environment.
Active Directory Security Assessments
For many organisations, Active Directory holds the keys to everything. We uncover the permissions, configurations and attack paths that could put them in the wrong hands.
Build & Configuration Reviews
Security controls are only effective if they’re configured correctly. We assess systems and environments against recognised best practice to identify gaps before attackers do.
Firewall Ruleset Reviews
Firewalls are designed to restrict access. Over time, they often end up doing the opposite. We review rulesets and configurations to ensure they’re providing protection, not creating risk.
Why Protos?
We don't just tell you what's wrong. We help you understand what matters, why it matters and what to do next.
CREST accredited penetration testing specialists
Real-world testing techniques
Clear reporting for technical and non-technical audiences
Practical remediation guidance
Trusted by organisations across highly regulated sectors
Testing tailored to your infrastructure and objectives
Want to know where you're exposed?
FAQs
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What's the difference between internal and external infrastructure testing?
External testing assesses the systems and services exposed to the internet. Internal testing simulates what could happen if an attacker gains access to your network, helping identify opportunities for privilege escalation, lateral movement and access to sensitive data.
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We already run vulnerability scans. Isn't that enough?
Not quite. Vulnerability scans identify known issues, but penetration testing goes further by combining automated tools with manual techniques to uncover complex attack paths, security weaknesses and misconfigurations that scanners can miss.
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How often should infrastructure testing be performed?
Most organisations perform infrastructure testing annually, or following significant changes such as migrations, acquisitions or major technology deployments. Regulated organisations may require more frequent testing.
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We host our infrastructure in the cloud. Do we still need penetration testing?
Usually, yes. While cloud providers secure the underlying platform, you’re still responsible for how your environment is configured, managed and accessed. Testing helps identify risks such as misconfigurations, excessive permissions and exposed services.
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Do I need external testing, internal testing or both?
That depends on your objectives and environment. External testing helps identify vulnerabilities visible from outside your organisation, while internal testing assesses the risks that could arise if an attacker gains access. Many organisations use both to gain a more complete picture of their security posture.
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How long does an infrastructure penetration test take?
Most external infrastructure assessments take between two and three days, while internal testing typically takes between three and five days. Larger or more complex environments may require additional time, which we’ll discuss during scoping.