The CalDAV feature in httpd is vulnerable to arbitrary code execution. It allows remote attackers to execute arbitrary code via a crafted HTTP PUT operation for an event with a long iCalendar property name.
access.redhat.com/errata/RHSA-2019:1771
lists.fedoraproject.org/archives/list/[email protected]/message/IGO43JS7IFDNITHXOOHOP6JHRKRDIYY6/
lists.fedoraproject.org/archives/list/[email protected]/message/PICSZDC3UGEUZ27VXGGM6OFI67D3KKLZ/
seclists.org/bugtraq/2019/Jun/9
usn.ubuntu.com/4566-1/
www.cyrusimap.org/imap/download/release-notes/2.5/index.html
www.cyrusimap.org/imap/download/release-notes/2.5/x/2.5.13.html
www.cyrusimap.org/imap/download/release-notes/3.0/index.html
www.cyrusimap.org/imap/download/release-notes/3.0/x/3.0.10.html
www.debian.org/security/2019/dsa-4458