Tool to demonstrate issue from this post found by mackey: https://www.dslreports.com/forum/r31377755-

Proof of concept code is already public elsewhere.

See CVE-2017-5693.

DoS occurs in either direction - UDP from LAN to WAN or WAN to LAN.

Testing through a local Virgin Media Super Hub 3 modem:

1mbps/2000pps   causes ~20ms average latency rise with 200 maximum
2mbps/4000pps   causes ~200ms average latency and 65% packet loss
3mbps/6000pps   causes ~250ms average latency and 85% packet loss