VNC token lifecycle mismanagement in OpenStack Nova (Essex 2012.1, Folsom 2012.2, Grizzly 2012.2) allows an authenticated tenant user to gain unauthorized interactive console access to another tenant's running VM under opportunistic timing conditions. When a VM is deleted, Nova fails to invalidate its associated VNC token; if the VNC port is subsequently recycled to a new VM, the stale token becomes valid for that new VM, breaking tenant isolation. No public exploit has been identified at time of analysis, and the EPSS score of 1.04% (77th percentile) reflects limited real-world exploitation, consistent with the timing-dependent nature of the attack and the end-of-life status of all affected releases.
Privilege Escalation
Canonical
Ubuntu Linux
Openstack
Essex
+2
NVD
GitHub
VulDB
CVSS 3.1
7.6
EPSS
1.0%