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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA threat assessment formally evaluates the degree and nature of a threat to an information system or organization. A risk assessment goes further. It identifies, estimates and prioritizes risks by combining threats with vulnerabilities, likelihood, potential impact and the controls already in place. A “threat and risk assessment” therefore asks two linked questions: what could go wrong, and how much does it matter if it does?
These definitions come from NIST’s information-security vocabulary, mainly SP 800-30 Rev. 1 and the CNSSI 4009 glossary. Other fields, such as workplace safety, physical security, public health and enterprise risk management, use their own standards and wording.
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The official definitions
Threat assessment
The NIST Computer Security Resource Center glossary lists this CNSSI 4009 definition: “Process of formally evaluating the degree of threat to an information system or enterprise and describing the nature of the threat.” The definition is specific to CNSSI 4009 as NIST lists it. It is not a universal one.
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NIST SP 800-30 Rev. 1, as reproduced in the NIST glossary, defines risk as “a measure of the extent to which an entity is threatened by a potential circumstance or event, and typically a function of (i) the adverse impacts that would arise if the circumstance or event occurs and (ii) the likelihood of occurrence.”
Risk assessment
In NIST’s usage, a risk assessment examines threat sources and events, vulnerabilities and predisposing conditions, likelihood, adverse impacts, and the controls planned or already operating. Its purpose is decision support. SP 800-30 says the results help senior leaders and executives choose a course of action in response to the risks identified.
Threat, vulnerability and risk are not synonyms
| Term | What it describes | Role in the assessment |
|---|---|---|
| Threat source / threat event | Who or what could cause harm, and the event that could result | Starting point: the possibility of harm |
| Vulnerability / predisposing condition | Weaknesses or circumstances that make an event more likely to succeed or more damaging | Exposure that a threat could exploit |
| Likelihood | How probable it is that a source initiates an event and that the event succeeds | First input to risk |
| Impact | The adverse effect on assets, operations, people or other organizations | Second input to risk |
| Risk | The combination of likelihood and impact, with uncertainty acknowledged | The output used to prioritize a response |
A threat is a possibility of harm. It is not a risk rating. A severe threat against a well-defended asset can carry modest risk. A minor threat against a fragile, critical system can carry a great deal.
How the process runs
NIST splits the work into three steps: prepare for the assessment, conduct it, and maintain it. Conducting it is meant to produce risks that can be prioritized and used to inform response decisions.
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Tasks within the conduct step
- Identify relevant threat sources and threat events.
- Identify vulnerabilities and predisposing conditions that could be exploited.
- Estimate the likelihood that threat sources initiate events and that those events succeed.
- Determine the adverse impacts if they do.
- Determine information security risk as a combination of likelihood and impact, including the uncertainty in each judgment.
As a plain-language chain: threat source, threat event, vulnerability or predisposing condition, likelihood of success, impact, risk priority, response decision. This chain is a way to understand the tasks. It is not a formula, and NIST does not require a single score.
Maintaining the assessment
The third step exists because the inputs change. Systems, threats, controls and business context all shift, so an assessment needs upkeep rather than one-time filing.
What to define before you start
- Scope: the whole enterprise, a mission or business process, or one system, and which assets and operations are in bounds.
- Threat characterization: the sources, the events and the circumstances in which they apply.
- Exposure: vulnerabilities and predisposing conditions, including controls that reduce them.
- Risk estimation: how likelihood and impact are rated, and how uncertainty is shown.
- Decision use: who acts on the result and what responses are available.
Common mistakes
- Fake precision. Qualitative levels such as low, moderate and high should not be presented as exact probabilities unless the method supports that.
- Treating the output as a prediction or a compliance document. Its job is to support decisions.
- Ignoring existing controls. Risk is assessed with planned and operating controls in view.
- Silently borrowing definitions. Outside information security, use the governing standard for that field.
Scope and currency
NIST SP 800-30 Rev. 1 was published on September 17, 2012, and addresses federal information systems and organizations. Check which revision and which organizational requirements apply before treating it as current compliance direction. The guidance is also widely used as a reference outside the federal setting.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
What is the difference between a threat assessment and a risk assessment?
A threat assessment characterizes the degree and nature of a threat. A risk assessment takes that further by weighing vulnerabilities, likelihood, impact and existing controls so risks can be ranked and acted on.
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Is a threat and risk assessment a single document or score?
No. NIST describes a process of preparing, conducting and maintaining the assessment, and does not mandate one score. The format depends on the method the organization chooses.
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