On Thursday 3 April 2025 at 09:16 UTC, a UDP reflection (DNS) targeted a developer platform customer in the Nordics. The attack peaked at 278.1 Gbps and lasted 57 minutes. Traffic originated from 2742 autonomous systems in 106 countries, predominantly hijacked home routers.
| Vector | UDP reflection (DNS) |
| Peak | 278.1 Gbps |
| Duration | 57 min |
| Time to mitigation | 0.859 s |
| Attack traffic reaching origin | 0.034% |
| Legitimate traffic challenged | 0.17% |
Timeline
The attack was preceded by no stated motive. Edge packet filters identified the flood by source port and payload signature and dropped it at line rate across 19 points of presence.
What the customer saw
A brief increase in p99 latency of 208 ms during the first minute, then normal service.
Recommendations
- Add a dedicated rate limit for the targeted route.
- Enable log streaming to your SIEM for faster correlation.
- Enable authenticated origin pulls.