On Sunday 28 December 2025 at 11:01 UTC, a UDP reflection (NTP) targeted a online casino customer in the Nordics. The attack peaked at 379.4 Gbps and lasted 48 minutes. Traffic originated from 1921 autonomous systems in 94 countries, predominantly hijacked home routers.
| Vector | UDP reflection (NTP) |
| Peak | 379.4 Gbps |
| Duration | 48 min |
| Time to mitigation | 0.225 s |
| Attack traffic reaching origin | 0.042% |
| Legitimate traffic challenged | 0.24% |
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 34 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.
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Review allow-listed partner ranges quarterly.
We moved from a scrubbing provider to always-on last year; time to mitigation went from minutes to basically nothing.
Would love a follow-up on how you handle HTTP/3 fingerprinting.