strongSwan 5.6.0 and older allows Remote Denial of Service because of Missing Initialization of a Variable.
https://www.debian.org/security/2018/dsa-4229
https://usn.ubuntu.com/3771-1/
https://security.gentoo.org/glsa/201811-16
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html