On Monday 7 April 2025 at 21:40 UTC, a SYN flood targeted a gaming community customer in the UK. The attack peaked at 250.4 Gbps and lasted 24 minutes. Traffic originated from 424 autonomous systems in 106 countries, predominantly a headless-browser farm.
| Vector | SYN flood |
| Peak | 250.4 Gbps |
| Duration | 24 min |
| Time to mitigation | 0.136 s |
| Attack traffic reaching origin | 0.004% |
| Legitimate traffic challenged | 0.42% |
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 28 points of presence.
What the customer saw
A brief increase in p99 latency of 158 ms during the first minute, then normal service.
Recommendations
- Enable log streaming to your SIEM for faster correlation.
- Enable authenticated origin pulls.
- Lower challenge thresholds on authentication endpoints during high-risk events.
Do you publish the edge IP ranges in a machine-readable format?