CVE-2021-40085

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.

• http://www.openwall.com/lists/oss-security/2021/08/31/2Mailing List, Patch, Third Party Advisory
• https://launchpad.net/bugs/1939733Exploit, Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/10/msg00005.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/05/msg00038.htmlMailing List, Third Party Advisory
• https://security.openstack.org/ossa/OSSA-2021-005.htmlPatch, Vendor Advisory
• https://www.debian.org/security/2021/dsa-4983Third Party Advisory
• http://www.openwall.com/lists/oss-security/2021/08/31/2Mailing List, Patch, Third Party Advisory
• https://launchpad.net/bugs/1939733Exploit, Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/10/msg00005.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/05/msg00038.htmlMailing List, Third Party Advisory
• https://security.openstack.org/ossa/OSSA-2021-005.htmlPatch, Vendor Advisory
• https://www.debian.org/security/2021/dsa-4983Third Party Advisory

Published

Aug 31, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

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