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💻 '''Cyber risk model''' refers to a quantitative framework used by insurers, reinsurers, and [[Definition:Insurtech | insurtech]] firms to estimate the frequency and severity of losses arising from cyber events — including data breaches, ransomware attacks, system outages, and widespread technology failures. Unlike [[Definition:Catastrophe model | catastrophe models]] for natural perils such as hurricanes or earthquakes, which draw on decades (or centuries) of historical loss data and well-understood physical processes, cyber risk models must contend with a threat landscape that evolves continuously as attackers innovate and technology stacks shift. Leading vendors — including firms like CyberCube, Moody's RMS, and Verisk — have developed proprietary platforms that combine threat intelligence, firmographic data, and actuarial techniques to produce probabilistic loss estimates at the individual-risk and portfolio-aggregate levels.

🔍 At their core, these models operate by mapping an organization's technology footprint and security posture to a library of attack scenarios, then simulating how each scenario propagates through the insured's systems and, critically, through interconnected third-party dependencies. A robust cyber risk model captures both attritional losses — the steady drumbeat of phishing incidents and small breaches — and systemic or [[Definition:Accumulation risk | accumulation]] events where a single vulnerability or cloud-provider outage triggers correlated claims across an insurer's book. Input data may include external scans of an organization's internet-facing infrastructure, [[Definition:Cybersecurity rating | cybersecurity ratings]], industry sector, revenue, geographic footprint, and historical claims. The model then generates outputs familiar to insurance professionals: [[Definition:Exceedance probability curve | exceedance probability curves]], [[Definition:Probable maximum loss (PML) | probable maximum loss]] estimates, and [[Definition:Value at risk (VaR) | value-at-risk]] metrics that feed into [[Definition:Reinsurance | reinsurance]] purchasing, [[Definition:Capital management | capital management]], and [[Definition:Regulatory capital | regulatory capital]] calculations under frameworks like [[Definition:Solvency II | Solvency II]] or the [[Definition:Risk-based capital (RBC) | RBC]] regime.

⚠️ Despite rapid advances, cyber risk models remain far less mature than their natural-catastrophe counterparts, and the industry treats their outputs with a healthy degree of skepticism. The absence of long, stable loss histories, the reflexive nature of cyber threats (attackers adapt when defenses improve), and the difficulty of modeling cascading systemic scenarios all introduce substantial [[Definition:Model risk | model uncertainty]]. Regulators in markets such as the UK, Singapore, and the EU increasingly expect insurers writing [[Definition:Cyber insurance | cyber]] business to demonstrate that they understand and manage accumulation risk, which has elevated the importance of these models in [[Definition:Enterprise risk management (ERM) | enterprise risk management]] and board-level reporting. For [[Definition:Underwriting | underwriters]] and portfolio managers, a cyber risk model is not a black-box oracle but a structured tool for stress-testing assumptions, calibrating [[Definition:Pricing | pricing]], and making informed decisions about where to deploy — or pull back — capacity in one of the fastest-growing lines of business in global insurance.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Cyber insurance]]
* [[Definition:Catastrophe model]]
* [[Definition:Accumulation risk]]
* [[Definition:Cybersecurity rating]]
* [[Definition:Probable maximum loss (PML)]]
* [[Definition:Systemic risk]]
{{Div col end}}

Definition:Cyber risk model - Revision history

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