| Package | Affected versions | Patched versions |
|---|---|---|
| org.eclipse.californium:californium-core | ≥ 2.0.0, < 2.7.3≥ 3.0.0, < 3.6.0 | 2.7.33.6.0 |
| californium | ≥ 2.0.0, ≤ 2.7.2≥ 3.0.0, ≤ 3.5.0 |
In Eclipse Californium versions 2.0.0 to 2.7.2 and 3.0.0-3.5.0 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.
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