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Security work does not always require attacking a running system. Threat modeling, design review, and source-code review can uncover risks by examining how software is planned and built; audits can examine whatever scope their terms define. These methods reduce uncertainty and produce evidence, but none proves that software is secure. They complement—not automatically replace—testing of software in execution.
What does “security work that never attacks anything” mean?
It describes work that can assess security without attempting to exploit a live target. The phrase is useful, but it is not a formal definition: a review or audit may include testing, and software verification can include techniques that execute code. The important distinction is the method and the evidence it produces.
NIST’s Secure Software Development Framework (SSDF) recommends integrating secure development practices into a software development life cycle rather than treating security as a final, separate step. NIST explains that few life-cycle models address software security in detail, so practices usually need to be added to each model. The SSDF Version 1.1 is the final publication dated February 3, 2022.
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NIST’s CSRC Glossary defines threat modeling as “A form of risk assessment that models aspects of the attack and defense sides of a logical entity, such as a piece of data, an application, a host, a system, or an environment.” The glossary identifies NIST SP 800-53 Rev. 5 as the definition’s source.
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In practical terms, a team considers what it is building, what needs protection, how the system could be misused or attacked, and which design choices could reduce the resulting risks. This is analysis of a system’s design and context; it does not require trying an exploit against a running service.
NIST’s SSDF design practice calls for identifying and evaluating security requirements, determining likely risks, and considering how design can mitigate them. That makes threat modeling useful early, while architecture and requirements can still change, and again as the system or its risks evolve.
How reviews, audits, threat models, and tests differ
These terms are related, but they do not describe interchangeable activities. The following distinctions are a practical way to scope work, not a formal NIST taxonomy.
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|---|---|---|---|
| Threat modeling | Requirements, data flows, architecture, trust boundaries, or an operating environment | Model and analyze potential attack and defense paths, then assess risks and mitigations | A reasoned set of risks and design responses |
| Security review | A defined design, code change, implementation, or configuration | Peer or specialist examination; may include tools or tests if included in scope | Observations and recommendations about the material reviewed |
| Security audit | Whatever scope and criteria the engagement specifies, such as controls, configurations, or development practices | Examine evidence against stated criteria; methods depend on the agreed scope | Findings and an assessment against the selected criteria |
| Execution-oriented testing | Running software or components under test | Exercise behavior with test cases, scanners, fuzzing, or other techniques | Observed behavior under the tests performed |
There is no single universal boundary for the word “audit” in the NIST sources discussed here. An audit might focus on documentation and controls, or its agreed scope might also include technical testing. Ask what will actually be examined rather than inferring the method from the label.
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How can software security be reviewed without attacking a live system?
Start with the stage of development and the question you need answered. A design risk may be easier to address before implementation; a code-level concern requires access to the relevant code; a question about runtime behavior calls for execution-oriented evidence.
- Define the decision. State what the work should help you decide—for example, whether a proposed architecture addresses identified risks, whether a change introduces a code-level weakness, or whether specified controls are in place.
- Set the scope. Identify the product, version, environment, components, people, and materials included. Specify whether the work covers requirements, architecture, source code, dependencies, configuration, operational controls, or running behavior.
- Choose methods that match the question. Design analysis and threat modeling can assess risks without exploitation. Code examination and static analysis inspect implementation without requiring a live attack. Tests that execute the software provide different evidence about observed behavior.
- Agree on evidence and follow-up. Request findings that identify the affected scope, supporting evidence, risk rationale, recommended action, an owner, and a plan for addressing or retesting issues. These are practical engagement terms, not a format mandated by NIST.
What verification techniques can complement review?
NIST’s 2021 publication, Guidelines on Minimum Standards for Developer Verification of Software, recommends a range of broadly applicable techniques. It does not address the totality of software verification, and its list should not be treated as a universal checklist for every product.
- Threat modeling for design-level issues.
- Automated testing, including black-box test cases and code-based structural test cases.
- Static code scanning and heuristic checks for hardcoded secrets.
- Built-in checks and protections.
- Historical test cases and fuzzing.
- Web application scanners where applicable.
- Attention to included code, such as libraries, packages, and services.
These techniques answer different questions. A model can expose a risky design assumption; static analysis can flag code patterns; an execution-based test can reveal behavior under the conditions it exercises. Combining appropriate methods gives a broader evidence base than relying on one technique alone.
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How to commission an independent review or audit
Before hiring an internal peer, outside specialist, or audit provider, agree on the work in writing. NIST’s SSDF implementation material includes an example of obtaining unbiased expert review for design decisions; independence can be useful when a team needs a fresh perspective, but it does not by itself define what the review covers.
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- Boundary: Name the systems, versions, environments, repositories, and exclusions.
- Criteria: State the security requirements, policies, or other criteria against which evidence will be assessed.
- Access: Specify what documentation, source code, configurations, test environments, and personnel the reviewer can access.
- Method: Say whether the work is modeling, document review, manual code examination, static tooling, execution-based testing, or a combination.
- Deliverables: Agree on how findings will be evidenced and prioritized, who receives them, and whether recommendations and remediation guidance are included.
- Follow-up: Decide how owners will respond, what constitutes resolution, and whether retesting is part of the engagement.
What NIST guidance does—and does not—establish
The NIST publications support a lifecycle approach to secure development and describe risk modeling and verification practices. They do not establish that any one review technique guarantees security, nor do the sources cited here define a single universal scope for a “security audit.” Treat findings as evidence that helps prioritize risk and improve a system, not as proof that no vulnerabilities remain.
Version status matters when citing the SSDF. Version 1.1 is NIST SP 800-218’s final publication, dated February 3, 2022. NIST’s page for SP 800-218 Rev. 1, Version 1.2 identifies it as an initial public draft published December 17, 2025, and says comments closed January 30, 2026. That page information does not establish that the draft is a final replacement.
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