CVE-2021-40085
MEDIUMCVSS 6.5/10EPSS 1.89%
Last modified
CVE-2021-40085 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 1.89% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openstack | Neutron | < 16.4.1 |
| Openstack | Neutron | >= 17.0.0, < 17.2.1 |
| Openstack | Neutron | >= 18.0.0, < 18.1.1 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Debian | Debian Linux | 11.0 |
References
- 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
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2021-40085?
CVE-2021-40085 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.89% probability of exploitation in the next 30 days.
How do I fix CVE-2021-40085?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-40085?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST