VDB
CVE-2021-20267
CVE-2021-20267
PUBLISHED
CVSS 7.099999904632568 HIGH
A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected.
EPSS 1.02% · 61.1th percentile
Risk Scores
CVSS 3.1
7.099999904632568
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
EPSS Score
1.02%
61.1th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:16.04:LTS | neutron | 0, *, * |
| Ubuntu:18.04:LTS | neutron | *, 0, 2:11.0.1-0ubuntu1 |
| Ubuntu:20.04:LTS | neutron | 2:16.0.0~b2~git2020020712.d5b33ffc77-0ubuntu1, 2:16.0.0~b1~git2019121613.3e8abb9a8f-0ubuntu1, 2:15.0.0-0ubuntu1 |
Timeline
- May 28, 2021 CVE Published
- May 29, 2021 EPSS Score
- Jul 13, 2021 EPSS Score
- Jul 31, 2021 EPSS Score
- Dec 1, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Jan 31, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- Jun 3, 2022 EPSS Score
- Aug 4, 2022 EPSS Score
- Oct 5, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2021-20267 third-party-advisory
- https://review.opendev.org/c/openstack/neutron/+/776599 third-party-advisory
- https://ubuntu.com/security/notices/USN-6067-1 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2021-20267 third-party-advisory