On Friday 4 July 2025 at 07:13 UTC, a GRE flood targeted a fashion retail customer in Western Europe. The attack peaked at 231.2 Gbps and lasted 161 minutes. Traffic originated from 1671 autonomous systems in 82 countries, predominantly a headless-browser farm.
| Vector | GRE flood |
| Peak | 231.2 Gbps |
| Duration | 161 min |
| Time to mitigation | 0.398 s |
| Attack traffic reaching origin | 0.018% |
| Legitimate traffic challenged | 0.05% |
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 39 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
- Keep origin IPs out of public DNS history.
- Enable log streaming to your SIEM for faster correlation.
- Lower challenge thresholds on authentication endpoints during high-risk events.