A flaw was found in dovecot before version 2.3.13. Mail parsing crashed when the 10 000th MIME part was message/rfc822 (or if parent was multipart/digest). This happened due to earlier MIME parsing changes for CVE-2020-12100.
Created dovecot tracking bugs for this issue:
Affects: fedora-all [bug 1912461]
A potential mitigation is configuring the mail transfer agent to not accept messages with more than 10,000 MIME parts.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 8
Via RHSA-2021:1887 https://access.redhat.com/errata/RHSA-2021:1887
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):