C3SA FIELD GUIDE

PENETRATION TESTING SCOPING GUIDE

A penetration test is only as useful as its scope. Define objectives, boundaries, safety constraints and evidence requirements before commissioning a test, so results answer the questions you actually have.

THE GUIDE

SIX THINGS TO DEFINE BEFORE THE TEST.

A well-defined scope produces findings you can act on and makes quotes easier to compare.

01

Choose objective-based testing goals

Start with what you need to know, such as whether an outside attacker could reach customer data, rather than a list of IP addresses. Objectives shape everything else.

Questions to ask

  • What decision will the test results inform?
  • Which assets or data would matter most if compromised?
  • Is this a compliance test, a risk test or both?
02

Define in-scope assets and identities

List the systems, applications, networks, cloud accounts and user roles in scope, and anything explicitly excluded.

Questions to ask

  • Which assets and environments are in scope?
  • Will testers receive credentials, and for which roles?
  • What is explicitly out of scope, and why?
03

Set rules of engagement

Rules of engagement set timing, permitted techniques, communication channels, escalation contacts and what happens if testers find evidence of a real compromise.

Questions to ask

  • When may testing take place?
  • Which techniques are not permitted?
  • Who do testers call if something breaks or a live incident is found?
04

Address cloud and third-party authorization

You can only authorize testing of systems you control. Cloud providers publish testing policies, and hosted or managed services may need the provider's permission.

Questions to ask

  • Which in-scope systems are hosted or managed by a third party?
  • Have we checked each provider's testing policy?
  • Do we have written permission where required?
05

Define safety constraints for OT and production

Production and operational technology need extra care. Agree which systems must not be disrupted, which techniques are excluded and the stop conditions.

Questions to ask

  • Which systems must remain available at all times?
  • Should OT be tested passively or in a replica?
  • What are the stop conditions?
06

Require retesting and remediation validation

A test is not finished when the report arrives. Build in retesting to confirm fixes worked, and ask for reproducible findings that developers and administrators can act on.

Questions to ask

  • Is retesting included, and within what timeframe?
  • Will findings include reproduction steps and business impact?
  • Who owns each finding after the test?

Last reviewed September 24, 2026. This guide is general information, not legal advice. Print or save this page to use it as a workshop handout or pre-engagement checklist.

NEXT STEP

MOVE FROM CHECKLIST TO EVIDENCE.

C3SA can help validate the current state, identify material gaps, define the target state and support implementation, testing and readiness.

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