On Sunday 14 December 2025 at 09:23 UTC, a UDP reflection (NTP) targeted a B2B SaaS customer in North America. The attack peaked at 326.9 Gbps and lasted 116 minutes. Traffic originated from 1462 autonomous systems in 65 countries, predominantly mobile carrier ranges.
| Vector | UDP reflection (NTP) |
| Peak | 326.9 Gbps |
| Duration | 116 min |
| Time to mitigation | 0.877 s |
| Attack traffic reaching origin | 0.033% |
| Legitimate traffic challenged | 0.47% |
Timeline
The attack was preceded by a ransom note demanding payment in Monero. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 28 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
- Enable authenticated origin pulls.
- Keep origin IPs out of public DNS history.
- Enable log streaming to your SIEM for faster correlation.