In a new Security Incident Report (SIR) created following the Amazon Web Services (AWS) outage, CyberCube, a provider of cyber risk analytics for the re/insurance industry, highlights the systemic risk from concentrated cloud-provider dependencies, revealing the exposure of digital ecosystems to a single cloud region/critical service failure.
The SIR has been created for CyberCube clients, as the firm aims to issue follow-on guidance as appropriate. Alongside that, the October 20th, 2025, outage also triggered CyberCube’s Cyber Aggregation Event Response Service (CAERS) initial procedures.
Particulars of the event reveal that the outage affected a broad set of downstream dependent platforms, including Snapchat, Fortnite, Roblox, Coinbase, and Ring. Details of the event show that the scale, duration, and geographic concentration of the disruption, centred in the US-East-1 (North Virginia) region, underscore the systemic risk of major cloud provider dependencies and specific regions.
Additionally, the area is crucial due to the fact that it stores AWS’s largest and oldest region, hosting core services, management infrastructure, and global control planes that other AWS regions and customers depend on for authentication, routing, and service coordination.
CAERS provides up-to-date intelligence on major cyber catastrophes globally in real time to ensure CyberCube clients have the most relevant information regarding significant aggregation events.
Additionally, the report explained that primary impacts are likely to affect system failure, which is non-malicious, and is contingent business interruption (CBI) coverage, as well as the potential for incident response and data restoration costs.
The SIR and blog added, “The outage affected a broad array of critical services across sectors with significant cloud reliance. While not all losses will be insured, the event could drive CBI claims, particularly among large enterprises with high sensitivity to service continuity.”
For assessment of the exposure to the highlighted vulnerability, CyberCube is advising re/insurers to review cloud provider dependencies in portfolios using its Single-Point-of-Failure (SPoF) Intelligence.
This will allow assessment for regional cloud concentration and accumulation per relevant SPoF across their books using the latest modelling developments, introduced in Portfolio Manager v6 earlier this year.
The programme can model losses from AWS outage scenarios using the platform’s core cloud infrastructure-related scenarios, thereby assessing potential impacts from cloud service disruptions across portfolios.
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