Vulnerability Details CVE-2020-27222
In Eclipse Californium version 2.3.0 to 2.6.0, the certificate based (x509 and RPK) DTLS handshakes accidentally fails, because the DTLS server side sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshake failure with TLS parameter mismatch. The DTLS server side must be restarted to recover this. This allow clients to force a DoS.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 45.6%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
Products affected by CVE-2020-27222
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cpe:2.3:a:eclipse:californium:2.3.0
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cpe:2.3:a:eclipse:californium:2.3.1
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cpe:2.3:a:eclipse:californium:2.4.0
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cpe:2.3:a:eclipse:californium:2.4.1
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cpe:2.3:a:eclipse:californium:2.5.0
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cpe:2.3:a:eclipse:californium:2.6.0