libvirt before 2.0.0 improperly disables password checking when the password on a VNC server is set to an empty string, which allows remote attackers to bypass authentication and establish a VNC session by connecting to the server.
| Software | From | Fixed in |
|---|---|---|
| redhat / libvirt | - | 1.3.5.x |
| debian / debian_linux | 8.0 | 8.0.x |