On Monday 20 July 2026 at 04:13 UTC, a SYN flood targeted a developer platform customer in the Nordics. The attack peaked at 100.3 Gbps and lasted 61 minutes. Traffic originated from 3564 autonomous systems in 51 countries, predominantly mobile carrier ranges.
| Vector | SYN flood |
| Peak | 100.3 Gbps |
| Duration | 61 min |
| Time to mitigation | 0.753 s |
| Attack traffic reaching origin | 0.023% |
| 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 16 points of presence.
What the customer saw
The customer’s status page stayed green throughout; they learned about the attack from our notification.
Recommendations
- Review allow-listed partner ranges quarterly.
- Lower challenge thresholds on authentication endpoints during high-risk events.
- Enable authenticated origin pulls.