A null-pointer dereference vulnerability was found in libtirpc before version 0.3.3-rc3. The return value of makefd_xprt() was not checked in all instances, which could lead to a crash when the server exhausted the maximum number of available file descriptors. A remote attacker could cause an rpc-based application to crash by flooding it with new connections.
https://usn.ubuntu.com/3759-2/
https://usn.ubuntu.com/3759-1/
https://lists.debian.org/debian-lts-announce/2018/08/msg00034.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-14622
https://bugzilla.novell.com/show_bug.cgi?id=968175