Open-Xchange: SSL Certification Expired And TLS Vulnerability

I Found SSL Certification Expired at https://licenses.dovecot.fi/
I Found Vulnerability CVE-2016-2183 lists.dovecot.fi

CVE-2016-2183

Description :
A flaw was found in the way the DES/3DES cipher was used as part of the TLS/SSL protocol. A man-in-the-middle attacker could use this flaw to recover some plaintext data by capturing large amounts of encrypted traffic between TLS/SSL server and client if the communication used a DES/3DES based ciphersuite.

Problem Location :
http://lists.dovecot.fi/

Mitigation :
TLS libraries and applications should limit the length of TLS sessions with a 64-bit cipher.

References :
https://sweet32.info/