On Wednesday 27 August 2025 at 19:36 UTC, a SYN flood targeted a crypto exchange customer in Southeast Asia. The attack peaked at 87.7 Gbps and lasted 146 minutes. Traffic originated from 2174 autonomous systems in 78 countries, predominantly a rented booter service.
| Vector | SYN flood |
| Peak | 87.7 Gbps |
| Duration | 146 min |
| Time to mitigation | 0.705 s |
| Attack traffic reaching origin | 0.086% |
| Legitimate traffic challenged | 0.15% |
Timeline
The attack was preceded by a breaking political story. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 17 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Review allow-listed partner ranges quarterly.
- Enable log streaming to your SIEM for faster correlation.
- Lower challenge thresholds on authentication endpoints during high-risk events.
Clear and practical, thanks.