NIST SP 800-115, Technical Guide to Information Security Testing and Assessment, gives security teams a practical way to plan authorized technical assessments. The core lesson is simple: testing should begin with scope, authorization, risk management, and reporting goals before anyone runs a scanner or validates a finding.
What NIST SP 800-115 covers
NIST describes SP 800-115 as guidance for designing, implementing, and maintaining technical information security test and examination processes. It is not a tool list or a permission slip. It is a planning framework that helps teams decide what to test, why they are testing it, how far assessors may go, and how results will be turned into action.
Official reference: NIST SP 800-115 final publication.
The four assessment phases
| Phase | Practical goal |
|---|---|
| Planning | Set objectives, authorization, scope, constraints, contacts, timing, and risk controls |
| Discovery | Identify systems, services, configurations, users, paths, and likely areas of weakness |
| Attack or validation | Safely validate selected vulnerabilities within written rules of engagement |
| Reporting | Explain findings, evidence, business impact, severity, remediation, and retest needs |
Planning questions before testing
Good assessments answer these questions before technical work begins:
- What business risk or control question is the assessment meant to answer?
- Who owns the systems and who has authority to approve testing?
- Which domains, IP ranges, applications, APIs, cloud accounts, and user roles are in scope?
- Which methods are prohibited because they could disrupt service or expose private data?
- Who should be contacted during a suspected outage, incident, or sensitive discovery?
- How will evidence be collected, protected, and deleted after the engagement?
- What report format will executives, engineers, auditors, or insurers need?
Rules of engagement checklist
A rules-of-engagement document should define allowed test windows, source IPs, credentials, social-engineering boundaries, data-handling limits, denial-of-service restrictions, escalation contacts, emergency stop conditions, and retest expectations.
This is especially important for production systems. Authorized testing can still cause harm if the team has not agreed on rate limits, notification procedures, or sensitive-data handling.
Discovery without losing control
Discovery should create a reliable map of the environment without overwhelming teams with noise. Combine asset inventory, DNS review, application mapping, cloud review, service enumeration, vulnerability scanning, configuration review, and log review.
Automated tools are useful, but results need human validation. False positives waste engineering time, and false negatives create a misleading sense of safety. For recurring coverage, pair assessment planning with automated vulnerability scanning.
Vulnerability validation and safety boundaries
NIST SP 800-115 includes validation because some findings cannot be prioritized from scanner output alone. Validation should be limited to what is necessary to prove risk. Assessors should avoid destructive actions, persistence, privacy-invasive access, or lateral movement beyond the written authorization.
For web applications, align validation with lawful web application security testing and clear reporting. For broader programs, use assessment results to decide whether a community bug bounty program is mature enough to launch.
What the final report should include
A useful report includes an executive summary, scope, methodology, dates, limitations, prioritized findings, evidence, business impact, remediation guidance, owners, target dates, and retest status. The best reports help engineering fix problems and help leaders understand risk.
Avoid dumping raw scanner exports as the main deliverable. Technical evidence belongs in the appendix or ticket details. Decision-makers need the risk story, affected assets, and next actions.
Common planning mistakes
Teams often underperform because they skip authorization details, test too broad a scope, ignore operational calendars, fail to define severity, or do not assign remediation owners. Another frequent gap is testing once and treating the report as the finish line. Assessment value comes from fixing, retesting, and improving controls.
How Hacker01 can support assessment planning
Hacker01 can help with lawful technical assessment scoping, rules of engagement, defensive testing plans, remediation workflows, and report structure. If you need help preparing an assessment or turning findings into action, start with Contact us.
FAQ
What is NIST SP 800-115?
NIST SP 800-115 is the Technical Guide to Information Security Testing and Assessment, a NIST publication for planning and conducting authorized technical security assessments.
Is NIST SP 800-115 a compliance standard?
It is guidance, not a certification standard. Organizations often use it to structure testing that supports risk management, audit readiness, and control validation.
What should be decided before testing starts?
Objectives, authorization, scope, excluded methods, contacts, timing, evidence handling, severity model, and reporting requirements should be agreed before testing.
Can NIST SP 800-115 be used for penetration testing?
Yes. It provides a planning and assessment structure that can support penetration testing when the work is authorized and scoped.
What is the most important output of an assessment?
The most important output is a prioritized, evidence-backed remediation plan that owners can act on and retest.