CVE-2020-17376: Openstack Nova

High severity, CVSS 8.3. EPSS: 1.7% chance of exploitation in the next 30 days.

An issue was discovered in Guest.migrate in virt/libvirt/guest.py in OpenStack Nova before 19.3.1, 20.x before 20.3.1, and 21.0.0. By performing a soft reboot of an instance that has previously undergone live migration, a user may gain access to destination host devices that share the same paths as host devices previously referenced by the virtual machine on the source host. This can include block devices that map to different Cinder volumes at the destination than at the source. Only deployments allowing host-based connections (for instance, root and ephemeral devices) are affected.

Affected products

• Openstack Nova: before 19.3.1 (fixed in 19.3.1); from 20.0.0, before 20.3.1 (fixed in 20.3.1); version 21.0.0 only

Published 2020-08-26. Last modified 2026-06-17.