On Thursday 18 September 2025 at 18:09 UTC, a UDP reflection (NTP) targeted a airline booking customer in Iberia. The attack peaked at 206.9 Gbps and lasted 123 minutes. Traffic originated from 4154 autonomous systems in 113 countries, predominantly residential proxy networks.
| Vector | UDP reflection (NTP) |
| Peak | 206.9 Gbps |
| Duration | 123 min |
| Time to mitigation | 0.463 s |
| Attack traffic reaching origin | 0.009% |
| Legitimate traffic challenged | 0.46% |
Timeline
The attack was preceded by an extortion email received two days earlier. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 18 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.
- Keep origin IPs out of public DNS history.
- Add a dedicated rate limit for the targeted route.