CVE-2020-17376

Name: CVE-2020-17376
Creator: NVD / NIST
Published: 2020-08-26T19:15:14.58+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.3/10EPSS 1.71%

Last modified Jun 17, 2026

CVE-2020-17376 is a high-severity vulnerability rated 8.3/10 on the CVSS scale. 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. EPSS estimates a 1.71% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L

EPSS Probability

1.71%

74.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-611

Affected Software

Vendor	Product	Versions
Openstack	Nova	< 19.3.1
Openstack	Nova	>= 20.0.0, < 20.3.1
Openstack	Nova	21.0.0

References

http://www.openwall.com/lists/oss-security/2020/08/25/4Mailing List, Patch, Third Party Advisory
https://launchpad.net/bugs/1890501Exploit, Third Party Advisory
https://security.openstack.org/ossa/OSSA-2020-006.htmlPatch, Vendor Advisory
http://www.openwall.com/lists/oss-security/2020/08/25/4Mailing List, Patch, Third Party Advisory
https://launchpad.net/bugs/1890501Exploit, Third Party Advisory
https://security.openstack.org/ossa/OSSA-2020-006.htmlPatch, Vendor Advisory

Timeline

Published: Aug 26, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-17376?

How severe is CVE-2020-17376?

CVE-2020-17376 has a CVSS score of 8.3/10 (HIGH severity). The EPSS model estimates a 1.71% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17376?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-17376?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST