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⚔️ '''Cyber warfare''' describes state-sponsored or politically motivated cyberattacks intended to disrupt, damage, or destroy another nation's critical infrastructure, economy, or government operations — and in insurance it sits at the center of one of the most contentious [[Definition:Coverage | coverage]] debates of the past decade. When [[Definition:Cyberattack | cyberattacks]] like NotPetya (2017) caused billions of dollars in collateral damage to private companies, [[Definition:Insurance carrier | carriers]] that had issued traditional property and [[Definition:Cyber insurance | cyber policies]] found themselves arguing over whether a [[Definition:War exclusion | war exclusion]] applied to a digital act carried out by a nation-state. The resulting litigation reshaped how the market thinks about the boundary between insurable [[Definition:Cyber liability | cyber liability]] and uninsurable acts of war.

📜 In response, Lloyd's of London and major carriers have introduced updated [[Definition:War exclusion | war-exclusion]] clauses — sometimes called cyber war exclusions or hostile-act exclusions — that attempt to carve out state-backed attacks from [[Definition:Cyber insurance | cyber policies]] while preserving coverage for conventional cybercrime. Drafting these exclusions is extraordinarily complex: attribution of a [[Definition:Cyberattack | cyberattack]] to a specific government is uncertain, the distinction between espionage and warfare is blurry, and collateral damage often hits companies with no connection to the geopolitical conflict. [[Definition:Underwriter | Underwriters]] and [[Definition:Insurance broker | brokers]] must now walk clients through scenario-based analyses to explain what is and is not covered, often referencing [[Definition:Cyber risk modeling | cyber risk models]] that simulate nation-state attack scenarios.

🌐 The stakes for the insurance industry extend well beyond individual policy wordings. If carriers exclude too broadly, [[Definition:Cyber insurance | cyber coverage]] loses much of its value and policyholders are left exposed to the most catastrophic tail risks. If exclusions are too narrow, a single coordinated [[Definition:Cyberattack | attack]] could generate [[Definition:Aggregation risk | aggregation losses]] that threaten carrier [[Definition:Solvency | solvency]]. [[Definition:Reinsurance | Reinsurers]] are particularly attentive, often requiring explicit cyber-war language before providing capacity. Regulators and policymakers have also entered the conversation, with some governments exploring public-private backstop mechanisms analogous to terrorism risk pools — an acknowledgment that [[Definition:Systemic risk | systemic cyber risk]] at the warfare level may ultimately exceed the private market's ability to absorb.

'''Related concepts'''
{{Div col|colwidth=20em}}
* [[Definition:War exclusion]]
* [[Definition:Cyber insurance]]
* [[Definition:Cyberattack]]
* [[Definition:Aggregation risk]]
* [[Definition:Systemic risk]]
* [[Definition:Terrorism risk insurance]]
{{Div col end}}

Definition:Cyber warfare - Revision history

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