The major AWS disruption of October 19-20, 2025 began with a latent race condition in DynamoDB's automated DNS management system and caused cascading effects across multiple AWS services.

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Location PART 1 - TONS OF PUNKS, ONE BIG JERK CHAPTER 2: NO MOAT IN BLOAT Ever-Vigilant Jerk

"The major AWS disruption of October 19-20, 2025 began with a latent race condition in DynamoDB’s automated DNS management system and caused cascading effects across multiple AWS services."

AWS's post-event report documents the DynamoDB DNS failure, subsequent EC2 and load-balancer problems, and impacts across multiple dependent AWS services.

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Source title Summary of the Amazon DynamoDB Service Disruption in the Northern Virginia (US-EAST-1) Region

Source authors Amazon Web Services

Source year 2025

Confidence high

Importance high