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TI-2021-17282 Aliases CVE-2021-40085GHSA-fh73-gjvg-349c

An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x…

Priority LOW 33Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1. Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value.

Why it matters now

EPSS 0.01866 79th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed neutron (PyPI): 16.4.1, 17.2.1, 18.1.1Red Hat: 4 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—neutron (PyPI)before 16.4.116.4.1Patch availableGHSA-fh73-gjvg-349c
—neutron (PyPI)17.0.0 to before 17.2.117.2.1Patch availableGHSA-fh73-gjvg-349c
—neutron (PyPI)18.0.0 to before 18.1.118.1.1Patch availableGHSA-fh73-gjvg-349c
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • neutron (PyPI) Vendor— Affected before 16.4.1 Fixed in 16.4.1 Patch available GHSA-fh73-gjvg-349c
  • neutron (PyPI) Vendor— Affected 17.0.0 to before 17.2.1 Fixed in 17.2.1 Patch available GHSA-fh73-gjvg-349c
  • neutron (PyPI) Vendor— Affected 18.0.0 to before 18.1.1 Fixed in 18.1.1 Patch available GHSA-fh73-gjvg-349c

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*before 16.4.1; 17.0.0 to before 17.2.1; 18.0.0 to before 18.1.1VulnerableOpenStack
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*10.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*11.0VulnerableDebian
  • cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:* Versions before 16.4.1; 17.0.0 to before 17.2.1; 18.0.0 to before 18.1.1 Vulnerable ·OpenStack
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian

Remediation

  • Fix · GHSA-fh73-gjvg-349c neutron (PyPI) Fixed in 16.4.1 Advisory →
  • Fix · GHSA-fh73-gjvg-349c neutron (PyPI) Fixed in 17.2.1 Advisory →
  • Fix · GHSA-fh73-gjvg-349c neutron (PyPI) Fixed in 18.1.1 Advisory →

Red Hat 4 advisories

  • RHSA-2021:3488 Released 2021-09-15 · Red Hat rating Important
    Red Hat OpenStack Platform 16.2 (openstack-neutron) security update
    • Red Hat OpenStack Platform 16.2 openstack-neutron-1:15.3.5-2.20210608154813.el8ost.3, openstack-neutron-common-1:15.3.5-2.20210608154813.el8ost.3, openstack-neutron-linuxbridge-1:15.3.5-2.20210608154813.el8ost.3 +7
  • RHSA-2021:3503 Released 2021-09-13 · Red Hat rating Important
    Red Hat OpenStack Platform 13.0 (openstack-neutron) security update
    • Red Hat OpenStack Platform 13.0 - ELS openstack-neutron-1:12.1.1-42.1.el7ost, openstack-neutron-common-1:12.1.1-42.1.el7ost, openstack-neutron-linuxbridge-1:12.1.1-42.1.el7ost +7
    • Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS Server openstack-neutron-1:12.1.1-42.1.el7ost, openstack-neutron-common-1:12.1.1-42.1.el7ost, openstack-neutron-linuxbridge-1:12.1.1-42.1.el7ost +7
  • RHSA-2021:3502 Released 2021-09-13 · Red Hat rating Important
    Red Hat OpenStack Platform 10.0 (openstack-neutron) security update
    • Red Hat OpenStack Platform 10.0 openstack-neutron-1:9.4.1-56.el7ost, openstack-neutron-common-1:9.4.1-56.el7ost, openstack-neutron-linuxbridge-1:9.4.1-56.el7ost +8
Show 1 more Red Hat advisories
  • RHSA-2021:3481 Released 2021-09-09 · Red Hat rating Important
    Red Hat OpenStack Platform 16.1 (openstack-neutron) security update
    • Red Hat OpenStack Platform 16.1 openstack-neutron-1:15.2.1-1.20210409073447.el8ost, openstack-neutron-common-1:15.2.1-1.20210409073447.el8ost, openstack-neutron-linuxbridge-1:15.2.1-1.20210409073447.el8ost +7

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenStack Platform 10.0Fixed RHSA-2021:3502
Red Hat OpenStack Platform 13.0 - ELSFixed RHSA-2021:3503
Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS ServerFixed RHSA-2021:3503
Red Hat OpenStack Platform 16.1Fixed RHSA-2021:3481
Red Hat OpenStack Platform 16.2Fixed RHSA-2021:3488
Not affected: 3 products
  • Red Hat Integration Camel K 1
  • Red Hat OpenStack Platform 17.1
  • Red Hat OpenStack Platform 18.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-40085
  2. 2026-10-03 Alias added: GHSA-fh73-gjvg-349c
  3. 2026-10-07 Affected versions changed · Red Hat
  4. 2026-10-08 Affected versions changed · Red Hat

References

Exploit 1

Patch 2

Advisory 4

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences