On Saturday 6 July 2024 at 10:39 UTC, a SYN flood targeted a crypto exchange customer in North America. The attack peaked at 155.4 Gbps and lasted 151 minutes. Traffic originated from 3786 autonomous systems in 70 countries, predominantly hijacked home routers.
| Vector | SYN flood |
| Peak | 155.4 Gbps |
| Duration | 151 min |
| Time to mitigation | 0.121 s |
| Attack traffic reaching origin | 0.058% |
| Legitimate traffic challenged | 0.39% |
Timeline
The attack was preceded by no stated motive. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 31 points of presence.
What the customer saw
No customer-visible impact. The on-call engineer was notified and acknowledged the incident from the dashboard.
Recommendations
- Enable authenticated origin pulls.
- Review allow-listed partner ranges quarterly.
- Add a dedicated rate limit for the targeted route.