On Sunday 25 January 2026 at 16:28 UTC, a SYN flood targeted a crypto exchange customer in the Benelux. The attack peaked at 316.6 Gbps and lasted 24 minutes. Traffic originated from 916 autonomous systems in 47 countries, predominantly a rented booter service.
| Vector | SYN flood |
| Peak | 316.6 Gbps |
| Duration | 24 min |
| Time to mitigation | 0.679 s |
| Attack traffic reaching origin | 0.060% |
| Legitimate traffic challenged | 0.80% |
Timeline
The attack was preceded by a competitor’s product launch. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 25 points of presence.
What the customer saw
A brief increase in p99 latency of 187 ms during the first minute, then normal service.
Recommendations
- Review allow-listed partner ranges quarterly.
- Enable authenticated origin pulls.
- Keep origin IPs out of public DNS history.
We had the exact false-positive issue with CGNAT carriers. The weighting change makes sense.
Verified good bots and allow-listed partners bypass challenges entirely.