On Monday 14 April 2025 at 08:06 UTC, a UDP reflection (DNS) targeted a news publisher customer in Western Europe. The attack peaked at 386.2 Gbps and lasted 152 minutes. Traffic originated from 105 autonomous systems in 42 countries, predominantly mobile carrier ranges.
| Vector | UDP reflection (DNS) |
| Peak | 386.2 Gbps |
| Duration | 152 min |
| Time to mitigation | 0.565 s |
| Attack traffic reaching origin | 0.079% |
| Legitimate traffic challenged | 0.11% |
Timeline
The attack was preceded by a breaking political story. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 14 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 log streaming to your SIEM for faster correlation.
- Review allow-listed partner ranges quarterly.
- Lower challenge thresholds on authentication endpoints during high-risk events.