The updated Exim pages from the EPEL project for RHEL 7 & 8 (and related
distributions e.g. CentOS) as well as Fedora 34 are now in the process of
being pushed to the stable repositories and should be there in the next few
hours or so:
https://bodhi.fedoraproject.org/updates/?packages=exim
That said, anyone reading this ought to update as soon as possible, without
waiting for them to reach the stable repositories.
Tim