A penetration testing methodology is a structured, repeatable process for planning, executing, and reporting a security test. It defines the phases a tester moves through, the standards that govern scope and conduct, and the evidence required to prove a finding. A sound methodology is what separates a genuine penetration test from an unstructured vulnerability scan: it makes results consistent, defensible, and comparable from one engagement to the next.
In practice, a methodology has two parts. The first is a recognized standard or framework that sets expectations for coverage and rigor. The second is a sequence of phases the tester follows on every engagement, from scoping through retesting. Understanding both is the fastest way to judge whether a provider is doing real work or simply running tools.
The main penetration testing methodologies and standards
Several established standards guide how penetration tests are scoped and carried out. Most professional engagements draw on more than one, choosing the framework that best fits the target and the compliance context.
PTES (Penetration Testing Execution Standard)
PTES is the most widely referenced end-to-end methodology. It defines seven stages, from pre-engagement interactions and intelligence gathering through threat modeling, exploitation, post-exploitation, and reporting. It applies broadly to network and infrastructure work and is a common backbone that teams adapt to specific engagements.
OWASP (Web Security Testing Guide and MASVS)
The OWASP Web Security Testing Guide (WSTG) is the reference standard for web application testing, cataloging test cases across authentication, session management, input validation, and business logic. For mobile, the OWASP Mobile Application Security Verification Standard (MASVS) plays the same role. Use OWASP when the target is an application rather than a network, and pair it with the OWASP Top 10 to communicate risk to stakeholders.
OSSTMM (Open Source Security Testing Methodology Manual)
OSSTMM takes a scientific, metrics-driven approach to security testing across physical, human, wireless, and data network channels. It emphasizes measurable operational security rather than a fixed checklist of vulnerabilities. It suits organizations that want a repeatable, quantifiable measure of their security posture over time.
NIST SP 800-115
NIST Special Publication 800-115, the Technical Guide to Information Security Testing and Assessment, is the recognized U.S. federal reference. It structures assessment into planning, discovery, attack, and reporting, and is frequently cited by government agencies and contractors. Reach for NIST 800-115 when you need a methodology that maps cleanly to federal and regulated environments.
MITRE ATT&CK
MITRE ATT&CK is a knowledge base of real-world adversary tactics and techniques rather than a start-to-finish testing process. Teams map their actions to ATT&CK technique IDs to show which attacker behaviors were exercised and which detections held. It is central to red team assessments and adversary emulation, where the goal is to mimic a specific threat actor.
PCI DSS penetration testing guidance
The PCI Security Standards Council publishes penetration testing guidance for organizations that handle payment card data. It specifies testing of the cardholder data environment, segmentation checks, and both external and internal testing at defined intervals. Apply it whenever PCI DSS compliance is in scope, since assessors expect the methodology to match this guidance.
The phases of a penetration test
Regardless of which standard governs an engagement, testers move through a consistent set of phases. Most methodologies describe between five and seven; the following seven cover the full lifecycle.
1. Planning and scoping (rules of engagement)
The engagement begins by defining objectives, in-scope targets, timing, and constraints in a written rules of engagement document. This phase sets the testing style (black box, gray box, or white box), authorizes the work, and establishes escalation paths so the test never disrupts production or crosses legal boundaries.
2. Reconnaissance and information gathering
Testers collect information about the target using open source intelligence, DNS records, employee data, and other passive and active techniques. The goal is to build an accurate picture of the attack surface before touching any system directly. Thorough reconnaissance is what surfaces forgotten assets and shadow infrastructure.
3. Scanning and enumeration
Here the tester actively probes discovered hosts and services to identify open ports, running software, versions, and potential weaknesses. Enumeration digs deeper into each service to pull usernames, shares, and configuration details. This phase turns a broad map into a prioritized list of candidate entry points.
4. Exploitation (gaining access)
The tester attempts to exploit confirmed weaknesses to gain access, safely proving that a vulnerability is real rather than theoretical. This can involve chaining lower-severity issues into a meaningful compromise. The emphasis is on validated impact, not volume of findings.
5. Post-exploitation and lateral movement
After initial access, the tester assesses what an attacker could actually reach: escalating privileges, moving laterally between systems, and locating sensitive data. This phase demonstrates business impact by showing how far a foothold can spread. It is where a routine finding becomes a board-level concern.
6. Reporting and remediation
Findings are documented with severity ratings, reproduction steps, evidence, and clear remediation guidance for both technical and executive audiences. A strong report prioritizes fixes by risk and ties each finding back to a concrete recommendation. This is the deliverable the organization uses to actually improve.
7. Retesting
Once fixes are applied, the tester re-examines the previously identified issues to confirm they are resolved and that no regressions were introduced. Retesting closes the loop and provides evidence for auditors and stakeholders. It is what turns a report into measurable risk reduction.
How methodology differs by test type
The same phases apply everywhere, but their emphasis shifts with the target. A network penetration test weights scanning, enumeration, and lateral movement across internal and external infrastructure. A web application penetration test leans on the OWASP WSTG, spending most of its time on authentication, access control, and business logic flaws rather than port scanning.
A cloud penetration test adapts the methodology to identity, misconfiguration, and provider-specific controls, working within the rules set by the cloud platform. A red team assessment stretches the methodology into a goal-based, stealth-driven operation mapped to MITRE ATT&CK, testing detection and response as much as prevention. For a full view of how these engagements fit together, see our penetration testing services overview.
Frequently asked questions
What is the standard penetration testing methodology?
There is no single mandated standard, but PTES (the Penetration Testing Execution Standard) is the most widely used general methodology, and its seven stages align closely with NIST SP 800-115. Web application testing usually follows the OWASP Web Security Testing Guide, while red team work maps to MITRE ATT&CK. Most professional teams combine the framework that best fits the target with a consistent phased process.
What is the difference between PTES and OWASP?
PTES is a broad, end-to-end methodology covering network and infrastructure engagements from pre-engagement through reporting. OWASP is application-focused: the Web Security Testing Guide and MASVS provide detailed test cases specifically for web and mobile apps. Teams often use PTES for the overall engagement structure and OWASP for the technical depth when an application is in scope.
How many phases are there in a penetration test?
Most methodologies describe between five and seven phases. A common seven-phase model is planning and scoping, reconnaissance, scanning and enumeration, exploitation, post-exploitation and lateral movement, reporting, and retesting. Frameworks label the stages slightly differently, but the underlying flow from scoping to remediation is consistent.
Which penetration testing methodology should we use?
Choose the framework that matches your target and compliance needs: OWASP for applications, NIST SP 800-115 for federal and regulated environments, PCI DSS guidance for payment data, and MITRE ATT&CK for red team and threat emulation. A qualified provider will select and combine these for you and document which standards the engagement follows. Request a scoped quote so the methodology can be tailored to your environment.
Is a penetration testing methodology the same as a vulnerability scan?
No. A vulnerability scan is an automated step that lists potential weaknesses, and it fits inside the scanning phase of a broader methodology. A full penetration test manually validates those weaknesses through exploitation and post-exploitation to prove real-world impact, then reports and retests. The methodology is the structured process that ties all of these steps together.