The gmp plugin in strongSwan before 5.7.1 has a Buffer Overflow via a crafted certificate.
lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html
download.strongswan.org/security/CVE-2018-17540/
lists.debian.org/debian-lts-announce/2018/10/msg00001.html
security.gentoo.org/glsa/201811-16
usn.ubuntu.com/3774-1/
www.debian.org/security/2018/dsa-4309
www.strongswan.org/blog/2018/10/01/strongswan-vulnerability-%28cve-2018-17540%29.html