You keep saying this - but seriously, do you really think a large missile can be fired from a speedboat?
Yes, in all likelihood. If the Russians can fit LACMs to smaller vessels (Buyan-M) than our River Class OPVs armed with 20-30mm cannon, I have no doubt there are unconventional naval capabilities out there that can do significant damage to the unaware and unprepared. Don’t base your thinking of enemy capability purely on our own way of doing things.