OpenVPN ovpn-dco-win vulnerabilities

Improper synchronization in OpenVPN ovpn-dco-win for Windows versions 0.6.5 through 1.3.5 and 2.4.0 through 2.8.7 allows local attackers to trigger a deadlock via a crafted write to the ovpn-dco device, causing the host to become unresponsive.

A use-after-free vulnerability in the OpenVPN ovpn-dco-win driver versions 2.5.0 through 2.8.6 allows local authenticated users to cause a system crash via crafted control messages.

In OpenVPN ovpn-dco-win versions 2.0.0 through 2.8.3, an incorrect buffer size calculation in the epoch key generator allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, causing a system crash.