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🛡️ '''Denial-of-service attack''' refers to a deliberate cyber assault designed to overwhelm a target's network, server, or application with illegitimate traffic, rendering it unavailable to legitimate users. Within the [[Definition:Cyber insurance | cyber insurance]] market, denial-of-service (DoS) attacks — and their more common distributed variant, DDoS attacks — represent one of the most frequently reported peril types, affecting insurers both as underwriters covering policyholders' losses and as potential targets themselves. Because the attack disrupts availability rather than stealing data, its financial impact manifests primarily through [[Definition:Business interruption insurance | business interruption]] losses, reputational harm, and the cost of mitigation and incident response, making it a distinct category of [[Definition:Cyber risk | cyber risk]] that demands tailored [[Definition:Underwriting | underwriting]] analysis.

⚙️ In a distributed denial-of-service scenario, an attacker marshals thousands or millions of compromised devices — a botnet — to flood the target with requests simultaneously. The target's infrastructure becomes saturated, causing legitimate transactions and communications to fail. For an insurer evaluating a [[Definition:Cyber insurance | cyber]] policy submission, the applicant's resilience to DDoS events is assessed through questions about content delivery networks, traffic scrubbing services, bandwidth capacity, and [[Definition:Incident response plan | incident response]] readiness. When a covered DDoS attack occurs, the [[Definition:Claims | claims]] process typically involves quantifying the period of downtime, calculating lost revenue under the policy's [[Definition:Business interruption insurance | business interruption]] provisions, and tallying the costs of forensic investigation and remediation. Many cyber policies impose a [[Definition:Deferred period | waiting period]] — often ranging from 6 to 12 hours — before business interruption coverage attaches, functioning much like a temporal [[Definition:Deductible | deductible]] to filter out brief disruptions.

💡 The growing frequency and sophistication of DDoS campaigns have reshaped how [[Definition:Insurance carrier | insurers]] and [[Definition:Reinsurance | reinsurers]] model cyber [[Definition:Aggregation risk | aggregation risk]]. A single botnet campaign targeting a major cloud service provider could simultaneously trigger business interruption claims across hundreds of policyholders — a systemic exposure that traditional per-risk underwriting struggles to capture. [[Definition:Catastrophe modeling | Catastrophe modeling]] firms and specialist [[Definition:Insurtech | insurtechs]] have developed scenario-based models to estimate the potential for such correlated losses, drawing parallels with [[Definition:Natural catastrophe | natural catastrophe]] aggregation. Regulators in jurisdictions including the European Union (under [[Definition:Digital Operational Resilience Act (DORA) | DORA]]) and the United States (through state-level cybersecurity requirements) increasingly expect both insurers and their policyholders to demonstrate operational resilience against denial-of-service threats, making the peril a central consideration in [[Definition:Risk management | risk management]] frameworks across the industry.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Cyber insurance]]
* [[Definition:Business interruption insurance]]
* [[Definition:Cyber risk]]
* [[Definition:Aggregation risk]]
* [[Definition:Incident response plan]]
* [[Definition:Ransomware]]
{{Div col end}}

Definition:Denial-of-service attack - Revision history

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