Incorrect Behavior Order: Early Amplification
In Eclipse Californium version 2.0.0-M1 through 2.7.2 and 3.0.0-M1 through 3.5.0, a DTLS resumption handshake falls back to a DTLS full handshake on a parameter mismatch without using a HelloVerifyRequest. Especially, if used with certificate based cipher suites, that results in message amplification (DDoS other peers) and high CPU load (DoS own peer). The misbehavior occurs only with DTLS_VERIFY_PEERS_ON_RESUMPTION_THRESHOLD values larger than 0.
CWE-408 - Incorrect Behavior Order: Early Amplification
The software allows an entity to perform a legitimate but expensive operation before authentication or authorization has taken place.