On Monday 20 October 2025 at 02:31 UTC, a UDP reflection (NTP) targeted a fashion retail customer in the Nordics. The attack peaked at 345.5 Gbps and lasted 57 minutes. Traffic originated from 205 autonomous systems in 118 countries, predominantly misconfigured open reflectors.
| Vector | UDP reflection (NTP) |
| Peak | 345.5 Gbps |
| Duration | 57 min |
| Time to mitigation | 0.785 s |
| Attack traffic reaching origin | 0.027% |
| Legitimate traffic challenged | 0.17% |
Timeline
The attack was preceded by a hacktivist channel announcing the target. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 21 points of presence.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Add a dedicated rate limit for the targeted route.
- Review allow-listed partner ranges quarterly.
- Enable log streaming to your SIEM for faster correlation.