Security Tests
PENETRATION TESTING
Apstorm's penetration testing helps keep your systems secure
Find Your Weaknesses Before Someone Else Does
Cyber threats are evolving faster than many organisations can defend. Hidden vulnerabilities, misconfigurations and overlooked attack paths create exploitable gaps in even the most mature security programmes.
For CISOs and IT leaders, the challenge lies in knowing whether existing defences truly work under pressure, while compliance managers struggle to link technical evidence to audit requirements. Without independent, expert testing, security confidence often relies on assumptions, and assumptions don’t stop breaches.
Penetration testing provides the clarity needed: real world validation of your defences, actionable insight for remediation, and credible assurance for stakeholders and regulators alike.
What Does Penetration Testing Do?
Identify Vulnerabilities Before Attackers
A penetration test identifies security weaknesses in networks, applications, endpoints, servers, and cloud services. This helps you fix issues before they are exploited, focusing on the most serious vulnerabilities.
Test Your Defences and Response
Penetration tests evaluate your security controls and monitoring systems. They show if your systems fail to detect attacks, helping you improve before a real threat occurs.
Lower Cyber Risk and Avoid Costs
Proactively testing your defences reduces the chance of a serious incident. Addressing vulnerabilities early is cheaper than managing a data breach or ransomware attack, saving you money and reputation
Meet Compliance Requirements
Many standards, such as PCI DSS and ISO 27001, require regular penetration testing. These tests provide proof of due diligence for compliance audits and customer security questionnaires.
Penetration Testing Priorities and Challenges by Role
Whether you lead security strategy, oversee IT operations, or manage compliance, penetration testing means something slightly different to each role. Your challenges, pressures, and success measures are unique, and understanding them is key to delivering meaningful results. The table below outlines how professionals across seven key roles typically approach penetration testing, highlighting their priorities, concerns, and areas of focus within a modern security programme.
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CISOs & Security Leaders
Primary Role Focus:
Strategic risk management and defence oversight
Key Penetration Testing Challenges:
- Balancing business continuity with security testing intensity.
- Justifying pen test spend to boards while proving ROI.
- Managing risk visibility across complex hybrid estates.
- Ensuring test coverage aligns with real-world threats, not just compliance.
- Turning findings into measurable security improvements.
IT Directors / Heads of IT
Primary Role Focus:
Overseeing infrastructure, uptime, and delivery
Key Penetration Testing Challenges:
- Minimising operational disruption during testing.
- Integrating pen test results into change management cycles.
- Bridging the gap between IT operations and security priorities.
- Lack of in-house expertise to interpret complex reports.
- Ensuring consistent remediation and patch management.
IT Compliance Managers
Primary Role Focus:
Ensuring ongoing regulatory and audit readiness
Key Penetration Testing Challenges:
- Linking pen test evidence to ISO 27001, PCI DSS, and GDPR requirements.
- Maintaining continuous compliance amid changing infrastructure.
- Dealing with incomplete or overly technical reports.
- Aligning findings to audit frameworks and corrective action logs.
Mid-market Enterprise IT & Security Teams
Primary Role Focus:
Delivering hands-on defence and system security
Key Penetration Testing Challenges:
- Co-ordinating tests across complex, multi-location estates.
- Managing multiple third-party systems and shadow IT.
- Maintaining test frequency amid rapid business change.
- Needing fast turnaround and clear prioritisation in reports.
SMB Owners
Primary Role Focus:
Managing limited budgets and resources
Key Penetration Testing Challenges:
- Cost-effectiveness and clarity on scope and value.
- Difficulty selecting a credible, trusted provider.
- Understanding technical findings and applying fixes.
- Ensuring compliance with growing customer or supplier demands (e.g., ISO, Cyber Essentials).
Public Sector Leaders
Primary Role Focus:
Protecting citizen data and public services
Key Penetration Testing Challenges:
- Aligning testing to NCSC CHECK and government assurance frameworks.
- Demonstrating compliance with public procurement and data protection standards.
- Managing budget constraints amid high accountability.
- Navigating supplier assurance and legacy system risks.
By recognising these differing perspectives, it becomes clear that effective penetration testing is not a one-size-fits-all exercise. Each role views risk, compliance, and assurance through a different lens — and a well-structured testing approach should reflect those priorities.
Types of Penetration Testing
Penetration testing services encompass a wide range of specialised assessments, each targeting different layers of an organisation’s digital environment. From networks and web applications to cloud platforms and social engineering, each test type replicates realistic attack scenarios to identify vulnerabilities and validate the effectiveness of existing security controls.
Network Penetration Testing
Identifies vulnerabilities in your IT infrastructure, servers, and network devices. External tests simulate attacks from outside your network, while internal tests mimic insider threats or breaching attackers seeking unauthorised access.
Cloud Security Assessments:
Reviews cloud environments (AWS, Azure, Google Cloud) for vulnerabilities, examining IAM policies, storage access, and container configurations to identify misconfigurations and improve security.
Web & Mobile App Testing:
Expert testing simulates real-world attacks on your web and mobile applications. We assess portals, e-commerce, and mobile apps for vulnerabilities like SQL injection, XSS, and OWASP Top 10 risks using automated tools and manual testing.
Wireless Network Penetration Testing:
Thorough assessments of Wi-Fi, Bluetooth, and wireless networks. We evaluate encryption strength, authentication mechanisms, and simulate attack scenarios to identify potential vulnerabilities.
IoT Security & Embedded Devices:
Evaluates connected hardware, including medical devices, vehicles, and industrial systems. Includes firmware analysis and testing of client-server interactions to identify vulnerabilities.
API and Software Application Testing:
Comprehensive testing focusing on authentication, authorization, rate limiting, and input validation to identify vulnerabilities and strengthen your software’s defences against threats.
Why use Apstorm for your penetration testing
Our CREST-certified penetration testers deliver independent, thorough security assessments across your IT estate. Using proven methodologies from OWASP, NIST and NCSC, we uncover exploitable weaknesses in your infrastructure, applications and cloud environments. Each test provides actionable, evidence-based insights to help you strengthen defences, meet compliance obligations, and maintain the trust of your customers and regulators.
How the Penetration Testing Process Works
Apstorm’s Penetration Testing service provides a controlled, safe simulation of cyberattacks to identify and validate vulnerabilities before they can be exploited. Our approach combines manual technical expertise with automated precision, ensuring no aspect of your environment goes unchecked.
Each engagement follows a structured six-phase methodology:
1.Initial Scoping
We begin with a careful scoping exercise to define test parameters with your decision makers. This identifies which systems, networks, applications, or facilities are in scope and what testing methods are permitted. Clear scoping ensures critical assets are covered while avoiding unintended impact on business operations. We establish rules of engagement, timelines, and goals – for example, in web application tests, we define specific domains or features as in scope while excluding destructive techniques like Denial of Service attackss.
2. Reconnaissance & Planning
Our testers gather Open-Source Intelligence (OSINT) and information about your target environment before launching active exploits. This reconnaissance phase includes mapping your network infrastructure, identifying public-facing assets like websites and firewall IP addresses, and understanding your digital footprint from an attacker’s perspective.
3. Vulnerability Discovery
We systematically identify security weaknesses using automated vulnerability scans and specialist tools to find known issues. Our testers use leading scanning tools to quickly identify potential flaws such as missing patches, misconfigurations, or unsafe software versions. We analyse attack paths to understand how vulnerabilities could be combined and evaluate the minimum risk they pose, including debriefs with your technical staff to validate findings
4. Exploitation & Attack Simulation
This stage demonstrates penetration testing’s true value beyond ordinary vulnerability scans. With your approval, our ethical hackers attempt to exploit identified vulnerabilities to gain unauthorised access. We might escalate privileges, pivot into internal networks, or chain multiple bugs into sophisticated attacks – exactly what malicious hackers would do. This phase is conducted carefully with safety checks to prevent damage while revealing the real-world impact of each flaw. excluding destructive techniques like Denial of Service attacks.
5. Post-Exploitation & Analysis
When we successfully breach systems, we perform controlled post-exploitation activities including gathering proof of access, mapping network traversal capabilities, and securely cleaning up any artifacts created during testing. This demonstrates the full extent of potential damage while maintaining the integrity of your systems
6. Reporting & Remediation Guidance
We compile comprehensive reports detailing findings, impacts, and recommended fixes. Reports prioritise issues by risk level and provide clear remediation steps, including executive summaries for management and technical sections for engineers. After delivery, we conduct review meetings with stakeholders and offer free re-testing of critical fixes to ensure lasting security improvements rather than just documentation.
The above methodology is derived from NIST SP800-115, OWASP v4.0.3, and NCSC CHECK-aligned best practice.
Our difference lies in agility, independence, and trusted expertise. We deliver fast, high-quality engagements with minimal disruption, translating technical findings into executive-ready insights
Why use Apstorm for your penetration testing
Our CREST-certified penetration testers deliver independent, thorough security assessments across your IT estate. Using proven methodologies from OWASP, NIST and NCSC, we uncover exploitable weaknesses in your infrastructure, applications and cloud environments.
Each test provides actionable, evidence-based insights to help you strengthen defences, meet compliance obligations, and maintain the trust of your customers and regulators.
Apstorm Offers
- CREST-Certified Testers: Verified by the UK’s leading accreditation body for penetration testing.
- Proven Track Record: Experience across regulated sectors, including finance, retail, and critical infrastructure.
- Approachable Expertise: We combine technical depth with responsive, client-focused communication.
- Agile Engagements: Rapid mobilisation and flexible scoping designed around client timelines and budgets.
- Quality Assured: Each report undergoes peer review and quality assurance before delivery.
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FAQ's - Penetration Testing
How is this different from automated vulnerability scanning?
Scans tell you what might be wrong. Pentesting confirms what can be exploited and how far an attacker could go. It connects the technical risk to your business impact.
What’s the difference between Penetration Testing and Red, Blue, or Purple Teaming?
Penetration testing finds and reports vulnerabilities at a point in time, while Red, Blue, and Purple Teaming simulate live attacks and defences to measure how well your people, processes, and technology respond in real time.
How do I know which systems should be in scope?
Start where compromise hurts most: internet-facing apps, remote access, cloud workloads, and core internal systems. Your supplier should help prioritise based on business criticality, compliance drivers and recent changes.
Can testing cover hybrid or third-party environments?
Yes, but permission and coordination are key. Cloud and supplier-hosted assets often require joint approval your test partner should guide you through this.
Will testing cause downtime or alerts?
Reputable providers plan around maintenance windows, throttle activity to avoid disruption, and pause immediately if any issues arise. You should never be surprised mid-test.
What value can I show to the board or audit committee?
A pentest provides evidence of due diligence, supports insurance and compliance, and delivers a measurable reduction in risk exposure all in a clear, board-level report.
Can results be shared with third parties (e.g. insurers, auditors)?
Yes. Reports are written to be auditable and can support claims, audits and assurance requests under NDA if required.
Will the tester help my team fix the findings?
Most reputable partners offer remediation support from developer briefings to joint validation sessions. Ask for practical, context-aware advice, not just generic fixes.
How often should I commission a pentest?
Annually at minimum, or after major system changes, acquisitions or compliance milestones. Continuous or subscription testing gives you rolling assurance between audits.
What questions should I ask before choosing a provider?
Ask about tester qualifications, tools, insurance coverage, turnaround times, report quality, and data-handling standards. The cheapest option rarely delivers best value.
What should I prepare before testing?
Authorised contacts, target lists (domains/IPs), test accounts, and escalation procedures. The clearer your prep, the smoother the engagement.