Welcome dear Linux Administrator!
A critical EXIM vulnerability was discovered which received code CVE-2019-10149.
More information can be obtained from official sources:
Using this vulnerability, attackers are able to gain full access to the server as root with the further execution of arbitrary code.
IMMEDIATELY (!) Upgrade Exim to version 4.92 (or higher).
Remember, you can always contact our support team for help.
with respect, IPhoster OU team