Here is a list of outstanding CVEs for OpenVPN
https://www.cvedetails.com/cve/CVE-2017-5868/
https://www.cvedetails.com/cve/CVE-2016-6329/
https://www.cvedetails.com/cve/CVE-2017-7478/
https://www.cvedetails.com/cve/CVE-2017-7479/
https://www.cvedetails.com/cve/CVE-2017-7508/
https://www.cvedetails.com/cve/CVE-2017-7520/
https://www.cvedetails.com/cve/CVE-2017-7521/
https://www.cvedetails.com/cve/CVE-2017-7522/