The problem can be corrected by updating your system to the following package versions: Ubuntu 14.04 ESM: spamassassin 3.4.2-0ubuntu0.14.04.1+esm3 In general, a standard system update will make all the necessary changes.
https://ubuntu.com/security/notices/USN-4899-2
https://ubuntu.com/security/notices/USN-4899-1
CVE-2020-1946
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