This page lists some potential vulnerabilities and they solutions.
In case of flooding from a peer, its IP can be banned for a period of time. If it recurs then the ban time is extended.
A peer steals the peerID from an other peer.¶
Flood of IMAlive message¶
A peer can flood this message to a targeted peer with a different peerId for each message.
If two many IMAlive message are sent from the same IP then the peer is banned.