Here is a list of outstanding CVEs for StrongSan
https://www.cvedetails.com/cve/CVE-2014-2338/
https://www.cvedetails.com/cve/CVE-2014-2891/
https://www.cvedetails.com/cve/CVE-2015-4171/
https://www.cvedetails.com/cve/CVE-2015-8023/
https://www.cvedetails.com/cve/CVE-2017-9022/
https://www.cvedetails.com/cve/CVE-2017-9023/
https://www.cvedetails.com/cve/CVE-2014-9221/