On Wednesday 29 November 2023 at 08:15 UTC, a SYN flood targeted a fashion retail customer in Iberia. The attack peaked at 183.7 Gbps and lasted 168 minutes. Traffic originated from 2018 autonomous systems in 9 countries, predominantly residential proxy networks.
| Vector | SYN flood |
| Peak | 183.7 Gbps |
| Duration | 168 min |
| Time to mitigation | 0.123 s |
| Attack traffic reaching origin | 0.087% |
| Legitimate traffic challenged | 0.10% |
Timeline
The attack was preceded by a publicly announced sales event. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 29 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Keep origin IPs out of public DNS history.
- Enable authenticated origin pulls.
- Lower challenge thresholds on authentication endpoints during high-risk events.