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Vulnerability record · CVE-2021-40085 · published 31 August 2021

CVE-2021-40085: Openstack neutron vulnerability

Openstack · Neutron

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.

6.5 CVSS 3.1 Medium EPSS 1.9% · top 20.4%
6.5CVSS 3.1 base score, v2 4.0
1.9%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2021/08/31/2 Mailing ListPatchThird Party Advisory
https://launchpad.net/bugs/1939733 ExploitIssue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html Mailing ListThird Party Advisory
https://security.openstack.org/ossa/OSSA-2021-005.html PatchVendor Advisory
https://www.debian.org/security/2021/dsa-4983 Third Party Advisory
http://www.openwall.com/lists/oss-security/2021/08/31/2 Mailing ListPatchThird Party Advisory
https://launchpad.net/bugs/1939733 ExploitIssue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html Mailing ListThird Party Advisory
https://security.openstack.org/ossa/OSSA-2021-005.html PatchVendor Advisory
https://www.debian.org/security/2021/dsa-4983 Third Party Advisory

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-40085), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.