OpenVPN 2.x before 2.0.11, 2.1.x, 2.2.x before 2.2.3, and 2.3.x before 2.3.6 allows remote authenticated users to cause a denial of service (server crash) via a small control channel packet. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-8104