CVE-2015-6927: Openvz Vzctl

Low severity, CVSS 3.6. EPSS: 0.5% chance of exploitation in the next 30 days.

vzctl before 4.9.4 determines the virtual environment (VE) layout based on the presence of root.hdd/DiskDescriptor.xml in the VE private directory, which allows local simfs container (CT) root users to change the root password for arbitrary ploop containers, as demonstrated by a symlink attack on the ploop container root.hdd file and then access a control panel.

Affected products

• Openvz Vzctl: up to and including 4.9.3

Published 2015-09-28. Last modified 2026-06-17.