On Tuesday 21 October 2025 at 08:34 UTC, a UDP reflection (NTP) targeted a online casino customer in the Nordics. The attack peaked at 230.3 Gbps and lasted 20 minutes. Traffic originated from 1988 autonomous systems in 9 countries, predominantly residential proxy networks.
| Vector | UDP reflection (NTP) |
| Peak | 230.3 Gbps |
| Duration | 20 min |
| Time to mitigation | 0.533 s |
| Attack traffic reaching origin | 0.058% |
| Legitimate traffic challenged | 0.66% |
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 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.
- Review allow-listed partner ranges quarterly.
- Lower challenge thresholds on authentication endpoints during high-risk events.
Could you share the dataset behind the percentages?
Could you share the dataset behind the percentages?
The billing model is what got our finance team on board, honestly.
Great to hear, thanks for sharing your experience.