Dovecot before 2.3.13 has Improper Input Validation in lda, lmtp, and imap, leading to an application crash via a crafted email message with certain choices for ten thousand MIME parts.
packetstormsecurity.com/files/160841/Dovecot-2.3.11.3-Denial-Of-Service.html
seclists.org/fulldisclosure/2021/Jan/18
www.openwall.com/lists/oss-security/2021/01/04/3
dovecot.org/pipermail/dovecot-news/2021-January/000451.html
dovecot.org/security
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GXDKFLOCUP7I4ELGQ2F4P5TGC6NXMYV7/
security.gentoo.org/glsa/202101-01
www.debian.org/security/2021/dsa-4825