On Wednesday 10 December 2025 at 03:11 UTC, a UDP reflection (DNS) targeted a healthcare portal customer in Latin America. The attack peaked at 250.5 Gbps and lasted 111 minutes. Traffic originated from 1776 autonomous systems in 117 countries, predominantly compromised cloud VMs.
| Vector | UDP reflection (DNS) |
| Peak | 250.5 Gbps |
| Duration | 111 min |
| Time to mitigation | 0.140 s |
| Attack traffic reaching origin | 0.038% |
| Legitimate traffic challenged | 0.10% |
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 40 points of presence.
What the customer saw
The customer’s status page stayed green throughout; they learned about the attack from our notification.
Recommendations
- Enable log streaming to your SIEM for faster correlation.
- Enable authenticated origin pulls.
- Keep origin IPs out of public DNS history.