CVE-2021-40085

MEDIUM

OpenStack Neutron <18.1.1 - Privilege Escalation

Title source: llm

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.

References (6)

[Mailing List, Patch, Third Party Advisory] http://www.openwall.com/lists/oss-security/2021/08/31/2

[Exploit, Issue Tracking, Third Party Advisory] https://launchpad.net/bugs/1939733

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2021/10/msg00005.html

[Mailing List, Third Party Advisory] https://lists.debian.org/debian-lts-announce/2022/05/msg00038.html

[Patch, Vendor Advisory] https://security.openstack.org/ossa/OSSA-2021-005.html

[Third Party Advisory] https://www.debian.org/security/2021/dsa-4983

Scores

CVSS v3 6.5

EPSS 0.0041

EPSS Percentile 61.1%

Attack Vector NETWORK

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

Classification

Status published

Affected Products (5)

openstack/neutron < 16.4.1

debian/debian_linux

pypi/neutron < 16.4.1PyPI

Timeline

Published Aug 31, 2021

Tracked Since Feb 18, 2026