CVE-2020-17376

Severity: high (CVSS 8.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-08-26 · updated 2026-06-17
Weakness: CWE-611

Description

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; from 20.0.0 before 20.3.1; 21.0.0 — fixed in 19.3.1, 20.3.1

How to fix

Upgrade to a fixed version: OpenStack Nova 19.3.1, 20.3.1. Check the vendor advisory for mitigations.

References

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