The gmp plugin in strongSwan before 5.7.1 has a Buffer Overflow via a crafted certificate.
http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html
http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html
https://download.strongswan.org/security/CVE-2018-17540/
https://lists.debian.org/debian-lts-announce/2018/10/msg00001.html
https://security.gentoo.org/glsa/201811-16
https://usn.ubuntu.com/3774-1/
https://www.debian.org/security/2018/dsa-4309
https://www.strongswan.org/blog/2018/10/01/strongswan-vulnerability-(cve-2018-17540).html
Source: MITRE
Published: 2018-10-03
Updated: 2019-12-01
Type: CWE-119
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH