On Sunday 31 August 2025 at 04:13 UTC, a UDP reflection (NTP) targeted a sports betting customer in Central Europe. The attack peaked at 251.7 Gbps and lasted 76 minutes. Traffic originated from 2319 autonomous systems in 44 countries, predominantly misconfigured open reflectors.
| Vector | UDP reflection (NTP) |
| Peak | 251.7 Gbps |
| Duration | 76 min |
| Time to mitigation | 0.222 s |
| Attack traffic reaching origin | 0.028% |
| Legitimate traffic challenged | 0.21% |
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
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Enable authenticated origin pulls.
- Enable log streaming to your SIEM for faster correlation.
- Keep origin IPs out of public DNS history.