The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 ESM: dovecot-core 1:2.2.9-1ubuntu2.6+esm2 Ubuntu 12.04 ESM: dovecot-core 1:2.0.19-0ubuntu2.8 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-4110-4
https://ubuntu.com/security/notices/USN-4110-1
CVE-2019-11500
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