Internal & external pen testing service from Bulletproof
Internal & External Network Pen Testing
Internal and external network security testing gives you complete visibility over your infrastructure.
CREST Certified Security Experts
Our network security testers are independently qualified by industry-recognised certification bodies such as CREST.
Modern Data Driven Platform
Our intuitive software uses a data driven dashboard to prioritise test results and provide key remediation guidance.
Continuous Automated Protection
Discover new security flaws and protect your business 24/7 with automated scans for continuous security.
Protect your business with internal & external pen testing
Cyber threats don’t just come from outside your network - insider risks, misconfigurations, and overlooked vulnerabilities can be just as damaging. Internal & external network penetration testing helps identify and eliminate security gaps across your entire infrastructure, keeping your business secure.
Internal vs External Network Penetration Testing Services
External and internal network penetration testing provide two different models of what an attacker could damage within your network. Bulletproof recommends a blended test with elements of internal and external network security testing, providing a comprehensive security assessment that helps prevent breaches before they happen.
Internal Penetration Tests
Internal infrastructure penetration testing evaluates security from within your network, assuming an attacker has gained access, or an insider threat is present. This helps identify misconfigurations, privilege escalation risks, and unauthorised access points.
External Penetration Tests
External infrastructure penetration testing simulates cyberattacks from outside your organisation, targeting internet-facing assets, firewalls, and perimeter defences. The goal is to identify vulnerabilities that could be exploited by hackers.
Why your business needs internal & external network pen testing
Cyberattacks can lead to severe financial and reputational damage, making recovery difficult. Internal and external network penetration testing services conducted by CREST certified pen testers ensures your business can safely identify weaknesses in a controlled environment. This allows you to assess where security defences are failing and prioritise improvements.
- Identify vulnerabilities in both internal and external environments
- Assess real-world cyber risks from both insider and outsider threats
- Ensure compliance with GDPR, PCI DSS, and other industry regulations and standards
- Strengthen your cybersecurity strategy with actionable insights
- Expose insecure functionality and logic flaws within your infrastructure
Cyber threats are ever evolving, which is why we include 12 months of free vulnerability scanning with every penetration testing package helping you stay ahead of emerging risks.
Get a fast quote for penetration testing services
Get my fast quotePenetration testing methodology
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Scope definition & pre-engagement interactions
We work with you to define your internal and external pen testing objectives and ensure we focus on business-critical areas.
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Intelligence gathering & threat modelling
Using advanced tools and reconnaissance techniques, we gather intelligence on internal and external network assets.
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Vulnerability analysis
Our team identifies a variety of weaknesses such as outdated components and security misconfigurations that could be exploited.
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Exploitation
We simulate real-world attack scenarios using a mix of custom exploits and industry tools.
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Post-exploitation
We assess the impact of a successful attack by attempting privilege escalation and lateral movement across systems.
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Reporting
After internal and external pen testing, you’ll receive a detailed report outlining security risks, vulnerabilities, and actionable remediation steps.
Internal & external pen testing FAQs
While external penetration testing simulates attacks from outside your organisation, targeting internet-facing assets, firewalls, and perimeter defences, internal penetration testing assumes an attacker has gained access to your network (or that an insider threat exists) and assesses misconfigurations, privilege escalation risks, and internal security weaknesses.
- Small networks: 2–3 days
- Medium networks: 5–10 days
- Large or complex networks: 10+ days
Every network pen test is customised to your infrastructure and security needs.
While we don’t offer free retesting, we do provide 12 months of free vulnerability scanning with every penetration testing package. This ensures ongoing security monitoring and helps you address newly emerging threats.
It is recommended, as cyber threats can come from both external attackers and insider threats. While external testing helps identify risks from hackers, internal testing ensures your internal infrastructure, user access controls, and data are secure from breaches caused by compromised accounts or insider misuse.
Internal pen testing is conducted with consideration of the environment in scope, whereas for production environments, we carefully coordinate testing activities to minimise disruptions and follow any restrictions, such as avoiding Denial-of-Service (DoS) testing.
Get a fast penetration test quote
Stay ahead of the hackers with penetration testing services to protect your systems, networks, apps & more.
- One of the leading pen test providers in the UK
- Combines automated scanning & human expertise
- Detailed threat analysis & breakdown
- Remediation advice with each threat
- Track threats & manage remediations
- Get a big-picture view of your security
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