One of them is associated with the update process of the freebsd-update tool, as it incorrectly deleted files in /etc/, in case that the file to be
updated matched the new release and was different than the old release …

Yeap sounds pretty … serious 🙂 Funny is that in order to apply the patch you have to use the same freebsd-update command lol

https://www.freebsd.org/security/advisories/FreeBSD-EN-23:09.freebsd-update.asc