A flaw was found in 389 Directory Server. A specially crafted search query could lead to excessive CPU consumption in the do_search() function. An unauthenticated attacker could use this flaw to provoke a denial of service.
https://lists.debian.org/debian-lts-announce/2018/10/msg00015.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14648