On Thursday 1 June 2023 at 19:45 UTC, a credential stuffing targeted a sports betting customer in Western Europe. The attack peaked at 318.4 million requests per second and lasted 61 minutes. Traffic originated from 2433 autonomous systems in 85 countries, predominantly mobile carrier ranges.
| Vector | credential stuffing |
| Peak | 318.4 million requests per second |
| Duration | 61 min |
| Time to mitigation | 0.194 s |
| Attack traffic reaching origin | 0.014% |
| Legitimate traffic challenged | 0.80% |
Timeline
The attack was preceded by a competitor’s product launch. Request rates on the targeted routes exceeded their hourly baseline by a factor of 806 within 38 seconds. The risk score of participating clients crossed the challenge threshold automatically and proof-of-work difficulty rose with origin load.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Enable authenticated origin pulls.
- Review allow-listed partner ranges quarterly.