On Sunday 24 May 2026 at 23:13 UTC, a Slowloris targeted a healthcare portal customer in the Nordics. The attack peaked at 709.7 million requests per second and lasted 78 minutes. Traffic originated from 75 autonomous systems in 61 countries, predominantly a headless-browser farm.
| Vector | Slowloris |
| Peak | 709.7 million requests per second |
| Duration | 78 min |
| Time to mitigation | 0.899 s |
| Attack traffic reaching origin | 0.083% |
| Legitimate traffic challenged | 0.61% |
Timeline
The attack was preceded by an extortion email received two days earlier. Request rates on the targeted routes exceeded their hourly baseline by a factor of 152 within 13 seconds. The risk score of participating clients crossed the challenge threshold automatically and proof-of-work difficulty rose with origin load.
What the customer saw
Checkout conversion was unchanged compared with the same hour of the previous week.
Recommendations
- Keep origin IPs out of public DNS history.
- Enable log streaming to your SIEM for faster correlation.
- Review allow-listed partner ranges quarterly.