CVE-2021-40085: OpenStack Neutron vulnerable to authenticated attackers reconfiguring dnsmasq via crafted extra_dhcp_opts value

CVE-2021-40085 · Severity: low · CVSS 3.1 · Published 2021-08-31

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.

Technologies: neutron (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2021-40085 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2021-40085 being exploited in the wild.
How severe is CVE-2021-40085?
Low severity, with a CVSS score of 3.1, published 31 August 2021.
Which products and versions are affected?
neutron (PyPI) ECOSYSTEM:introduced=0,fixed=16.4.1, ECOSYSTEM:introduced=0,fixed=16.4.1,introduced=17.0.0,fixed=17.2.1,introduced=18.0.0,fixed=18.1.1.
Is there a fix for CVE-2021-40085?
Yes. neutron (PyPI): upgrade to 16.4.1, 18.1.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2021-40085?
Check whether you run neutron (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • neutron (PyPI): upgrade to 16.4.1, 18.1.1 or later
    pip install "neutron>=18.1.1"

Affected products

  • neutron (PyPI) ECOSYSTEM:introduced=0,fixed=16.4.1, ECOSYSTEM:introduced=0,fixed=16.4.1,introduced=17.0.0,fixed=17.2.1,introduced=18.0.0,fixed=18.1.1

Identifiers

  • CVE-2021-40085
  • GHSA-fh73-gjvg-349c
  • PYSEC-2021-361

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