Vulnerability Details : CVE-2021-20267
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.
Vulnerability category: Denial of service
Products affected by CVE-2021-20267
- cpe:2.3:a:redhat:openstack_platform:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openstack_platform:16.1:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openstack_platform:13.0:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:openstack_platform:16.2:*:*:*:*:*:*:*
- cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
- cpe:2.3:a:openstack:neutron:*:*:*:*:*:*:*:*
- cpe:2.3:a:openstack:neutron:18.0.0:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-20267
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 27 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20267
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.5
|
MEDIUM | AV:N/AC:L/Au:S/C:P/I:N/A:P |
8.0
|
4.9
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H |
2.8
|
4.2
|
NIST |
CWE ids for CVE-2021-20267
-
The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.Assigned by: secalert@redhat.com (Primary)
References for CVE-2021-20267
-
https://security.openstack.org/ossa/OSSA-2021-001.html
OSSA-2021-001: Anti-spoofing bypass for Open vSwitch networks — OpenStack Security Advisories 0.0.1.dev253 documentationPatch;Vendor Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1934330
Issue Tracking;Patch;Third Party Advisory
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