Our Pentesting Methodology & Process | 6-Phase Guide

Our Pentesting Methodology & Process

A penetration testing methodology is a structured, repeatable framework that governs every stage of a penetration test, from initial scoping through to reporting and remediation.

This page explains how that framework works in practice, how it maps to recognised standards, and what you should expect before, during, and after an engagement.

Pentesting Company delivers this as a scoped commercial service: TEST. FIND. FIX. PROTECT. You buy a decision-making framework that decides coverage, depth, and whether results can be defended to auditors, boards, and insurers — not an ad-hoc tool run.

What Is a Penetration Testing Methodology?

A penetration testing methodology is a structured, repeatable framework that governs every stage of a penetration test, from initial scoping through to reporting and remediation. Methodology is what separates professional pentesting from ad-hoc hacking. It is the operating system of the engagement: it decides coverage, depth, and whether results can be defended to auditors, boards, and insurers.

Methodology is the part buyers should evaluate first, because two firms can use similar tools and still produce very different coverage. It ensures consistency, comprehensiveness, and alignment with industry standards. We align our work to PTES, NIST SP 800-115, and OWASP WSTG.

A methodology is not a checklist of tools. It is a decision-making framework that guides how testers think, plan, and execute. A methodology-driven provider is more likely to deliver complete, defensible, and repeatable results.

Our 6-Phase Pentesting Process

Our methodology follows six distinct phases, aligned to PTES and NIST SP 800-115. Each phase has a client-facing purpose, a tester activity, and a defined output so you know what you are paying for at every stage. The same phase model is applied across penetration testing services, then tailored for web application testing, network testing, and related engagements.

1. Phase 1 — Scoping & Pre-Engagement: formal agreement of objectives, assets, constraints, and rules of engagement. Provide an asset inventory, diagrams, and proposed limits. An honest unknowns list is safer than a tidy inventory that omits SaaS or cloud accounts on the real path.
2. Phase 2 — Intelligence Gathering: passive and active reconnaissance to map the real attack surface. OSINT and authorised mapping produce a target list; clients typically see confirmation of in-scope hosts, exposed services, and unexpected findings such as forgotten subdomains.
3. Phase 3 — Threat Modelling & Vulnerability Analysis: rank likely attack paths, then combine scanning with manual testing. Manual work finds business-logic flaws and chained exploits. OWASP WSTG-style checks apply to apps and APIs: authentication, session handling, access control, and admin workflows.
4. Phase 4 — Exploitation: controlled proof of real-world impact within agreed safety limits. Testers exploit only far enough to demonstrate impact, then stop. Where a proof would be unsafe on production, they document a constrained proof and residual risk.
5. Phase 5 — Post-Exploitation: show how far an attacker could go after initial access — lateral movement, privilege escalation, and persistence where authorised. This converts a single hole into a blast-radius statement boards and insurers can use.
6. Phase 6 — Reporting & Remediation Support: executive summary, technical findings, CVSS, evidence, and fix guidance. Prioritisation support and retesting confirm the path is closed. You should brief a non-technical stakeholder from the first pages and hand the rest to engineers without translation.

Use the table to check that a proposal covers pre-engagement, post-exploitation, and remediation support, not only scanning and a PDF.

How Our Methodology Aligns with Industry Standards (PTES, NIST, OWASP)

Industry-standard alignment maps our six phases to recognised frameworks so coverage is auditable, not invented in isolation. Different frameworks use 4, 5, 6, or 7 phases. That difference is granularity, not correctness.

A five-step marketing diagram can still be a complete test if pre-engagement, threat modelling, and post-exploitation happen inside other labels. A seven-step diagram can still be thin if those labels are not actually staffed.

PTES is a seven-phase standard covering pre-engagement interactions, intelligence gathering, threat modelling, vulnerability analysis, exploitation, post-exploitation, and reporting. NIST SP 800-115 is a four-phase technical guide: planning, discovery, attack, and reporting. OWASP WSTG is the web-application testing guide used when the target is an application, API, or browser-facing workflow. OSSTMM and ISSAF remain useful alternative references.

We align with PTES for depth in pre-engagement and post-exploitation, and with NIST for its compliance-friendly structure. MITRE ATT&CK is used as a reference language for threat-informed testing and red team style narratives, not as a replacement for a pentest methodology.

Framework names on a proposal only help if the mapping is explicit. Ask the provider to show how their phases cover PTES pre-engagement and post-exploitation, not just a scan-and-report loop.

What to Expect During a Pentest Engagement

A professional pentest engagement is a controlled, time-boxed exercise with agreed communication, testing windows, and stop procedures so production systems stay protected. The aim is evidence of risk, not surprise downtime. Schedule active testing away from peak trading or release freezes where you can. Have someone available who can interpret alerts and approve a pause.

Communication

Daily status plus immediate contact for critical findings. Unexpected high-impact issues are raised as soon as they are confirmed. Nominate a single point of contact and an urgent channel before day one. Daily notes should say what was tested, what is blocked, and what is planned next.

Testing Windows

Hours agreed in scoping for active work against live systems. Out-of-hours testing can be arranged when peak trading risk is high. Passive review and report writing can continue outside those windows without touching production.

Safety Protocols

Emergency stop procedures halt testing if an unexpected issue appears. The client can stop the test; testers can also pause if behaviour looks unsafe. Testers stop the relevant activity, notify the named contact, preserve evidence, and only resume after you agree.

Pentesting vs. Vulnerability Assessment vs. Red Teaming

A vulnerability assessment, a penetration test, and a red-team engagement are three different services. Choose the one that matches the decision you need to make, not the most dramatic label. Pentesting does not replace vulnerability management, audits, or social-engineering tests.

Over-buying a red team when a pentest answers the question wastes time. Under-buying a scan when you need exploit evidence leaves auditors with a list, not proof. External tests suit internet-facing assets; internal tests simulate an insider or a foothold already inside. Combine types when the decision needs both perimeter and inside-out evidence.

How to Scope a Penetration Test

Scoping defines what will be tested, why, under which constraints, and with which emergency rules. Poor scope is the most common reason engagements miss the systems that matter or cost more than they should. A thorough test of fewer systems usually beats a shallow pass over everything.

A scoping call covers business objectives, critical systems, compliance requirements, and testing constraints. Rules of engagement lock testing windows, emergency contacts, allowed techniques, and systems that are off-limits.

Common mistakes are under-scoping to save money, over-scoping to feel thorough, omitting third-party systems on the real path, and leaving compliance requirements vague. Cost depends on scope, test type, complexity, and whether retesting is included.

What to prepare for your scoping call

• Asset inventory (hosts, apps, APIs, cloud accounts, third parties in path)
• Network diagrams and trust boundaries
• List of critical systems and data classes
• Business and compliance objectives, including deadlines
• Preferred testing windows and emergency contacts
• Systems, techniques, or environments that are off-limits
• Named point of contact with authority to pause testing

After the Report: Remediation, Retesting, and Prioritisation

Post-report work converts findings into a sequenced fix plan, then retesting confirms the attack path is closed. The report is a decision pack, not the end of the engagement. Fixes are cheaper while testers still remember the path and evidence is fresh.

Prioritise using CVSS, business context, and exploitability together. Remediation support means guidance on fixes and help ranking work — not usually a commitment to implement changes unless separately agreed. Confirm in writing whether retesting sits inside the original engagement.

• Fix first: vulnerabilities that are exploitable, internet-facing, and impact critical systems.
• Fix second: vulnerabilities that require local access or have lower impact.
• Monitor: informational findings and hardening recommendations.

UK Compliance Considerations

UK compliance-driven pentesting produces evidence that technical and organisational controls have been tested, not merely documented. Cyber Essentials is not replaced by a pentest, but a test finds gaps before you submit. UK GDPR requires appropriate measures; a documented, scoped pentest with remediation follow-up demonstrates due diligence. ICO expectations include testing security controls. PCI DSS requires regular pentesting in cardholder environments. ISO 27001 and SOC 2 treat independent testing as support for certification. HIPAA is not the usual UK driver.

For UK organisations, a pentest is not just good practice. It is often a compliance requirement. Our methodology produces evidence that supports Cyber Essentials, UK GDPR, and PCI DSS obligations.

Questions to Ask Any Pentesting Provider

• Which frameworks does your methodology align with (PTES, NIST, OWASP)?
• Who will actually perform the test? What are their qualifications and experience?
• What does the report include? Is there an executive summary for non-technical stakeholders?
• Is retesting included after remediation?
• How do you handle findings during the test? Will you notify us immediately if you find something critical?
• How do you protect production systems during testing?
• What does your scoping process involve? What do you need from us?

Frequently Asked Questions