CVE-2022-2576: Eclipse Californium

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

In Eclipse Californium version 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.

Affected products

• Eclipse Californium: from 2.0.0, up to and including 2.7.2; from 3.0.0, up to and including 3.5.0

Published 2022-07-29. Last modified 2026-06-17.