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High, CVSS 8.7amended

OpenStack Nova Live migration fails to update persistent domain XML

CVE-2020-17376GHSA-c7w7-9c85-4qxv

What to do

Partial vendor fix. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI nova

    Affected
    < 19.3.1>= 20.0.0, < 20.3.1>= 21.0.0, <= 21.0.0
    Fixed in
    20.3.1, 19.3.1

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2020-17376: 1.73% estimated exploitation activity in the next 30 days; percentile 77.61 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 3 · amended ·

    Amended from ghsa record GHSA-c7w7-9c85-4qxv

  2. Revision 2 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 1 · created ·

    Published from osv record GHSA-c7w7-9c85-4qxv

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2020-17376

Advisory: OpenStack Nova Live migration fails to update persistent domain XML
IDs: CVE-2020-17376, GHSA-c7w7-9c85-4qxv
Record: https://patchnext.com/advisories/cve-2020-17376 (revision 3, source checked 26 Oct 2026, 13:18 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Partial vendor fix; fixed versions by package: nova 20.3.1, 19.3.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI nova: affected < 19.3.1; >= 20.0.0, < 20.3.1; >= 21.0.0, <= 21.0.0; fixed in 20.3.1, 19.3.1

## Suggested inspection (read-only)
- `python -m pip show nova`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nova.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-c7w7-9c85-4qxv (OSV record GHSA-c7w7-9c85-4qxv lists affected ranges: PyPI nova >=0 =20.0.0 <20.3.1 (fixed))
- Verified: https://github.com/advisories/GHSA-c7w7-9c85-4qxv (GitHub-reviewed advisory GHSA-c7w7-9c85-4qxv lists affected ranges: PyPI nova >=0 =20.0.0 =21.0.0 <=21.0.0)

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