> Exploitability over the internet is unlikely, most ISP routers drop packets with ipoptions fields.
That doesn't track. Apple iPhones are a major user of MPTCP and they report the majority of requests supporting MPTCP, IIRC 70+%.
MPTCP uses TCP options fields, the vulnerability is in IP options.
There are two types of multipath TCP and they are not at all the same.
What Apple does is, for example, being able to have a connection over WiFi and 5G simultaneously, with different IPs and routes.
The more traditional server side multipath is that you have a network card with 4 ports (eg 4x 25gbit) and connect them to a router, and make those 4 physical ports (paths) behave like a single interface. This helps either load balancing or redundancy.
The latter is what this vulnerability is about.
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