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⚠️ '''Systemic cyber risk''' describes the potential for a single cyber event — whether a coordinated attack, a vulnerability in widely used software, or a failure of shared digital infrastructure — to trigger correlated losses across a large number of [[Definition:Insurance policy | policyholders]] simultaneously, creating an [[Definition:Accumulation risk | accumulation]] exposure for [[Definition:Insurance carrier | insurers]] and [[Definition:Reinsurance | reinsurers]] that is conceptually analogous to [[Definition:Natural catastrophe | natural catastrophe]] risk but distinct in its propagation dynamics. In insurance, the concern is not merely that cyber events are frequent or costly in isolation, but that the interconnected nature of modern technology — shared cloud providers, ubiquitous operating systems, common software libraries — means a single point of failure can cascade across industries and geographies with a speed and breadth that challenges traditional [[Definition:Diversification | diversification]] assumptions.

⚙️ Modeling systemic cyber risk is one of the most complex challenges facing the insurance industry today. Unlike windstorms or earthquakes, where hazard footprints are geographically bounded, a systemic cyber event can simultaneously affect policyholders on different continents who share a common technology dependency. Specialist [[Definition:Cyber risk model | cyber catastrophe models]] — developed by firms such as CyberCube, Moody's RMS, and others — attempt to simulate scenarios including cloud provider outages, widespread [[Definition:Ransomware | ransomware]] campaigns, and zero-day exploits in critical software. [[Definition:Underwriter | Underwriters]] use these models to estimate [[Definition:Probable maximum loss (PML) | probable maximum loss]] and manage portfolio-level accumulations, while [[Definition:Reinsurance | reinsurers]] rely on them to structure [[Definition:Catastrophe excess of loss | catastrophe excess-of-loss]] treaties and [[Definition:Insurance-linked securities (ILS) | ILS]] transactions for cyber. Regulators in the UK, EU, and United States have flagged systemic cyber risk as a supervisory priority, pressing insurers to demonstrate that their [[Definition:Exposure management | exposure management]] frameworks can capture correlated cyber scenarios.

🌐 The industry's ability to insure cyber risk at scale depends on solving the systemic risk puzzle. If a single event can generate insured losses comparable to a major hurricane — but without the geographic containment that allows [[Definition:Catastrophe bond | catastrophe bonds]] and regional diversification to work — then the [[Definition:Insurability | insurability]] of cyber depends on accurate accumulation measurement, appropriate [[Definition:Policy limit | limits management]], and potentially new forms of public-private risk-sharing for truly catastrophic scenarios. Discussions around government [[Definition:Backstop | backstops]] for systemic cyber events are underway in multiple jurisdictions, mirroring frameworks like the U.S. [[Definition:Terrorism Risk Insurance Act (TRIA) | Terrorism Risk Insurance Act]] or the UK's [[Definition:Pool Re | Pool Re]]. For [[Definition:Insurtech | insurtech]] firms and data analytics providers, systemic cyber risk represents both a commercial opportunity — demand for better models, monitoring tools, and aggregation analytics is intense — and a defining test of whether the industry can extend the boundaries of [[Definition:Insurability | insurability]] into the digital age.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Accumulation risk]]
* [[Definition:Cyber risk model]]
* [[Definition:Standalone cyber insurance]]
* [[Definition:System failure coverage]]
* [[Definition:Catastrophe modeling]]
* [[Definition:Terrorism Risk Insurance Act (TRIA)]]
{{Div col end}}

Definition:Systemic cyber risk - Revision history

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