Vulnerability · Published May 28, 2021 · Assigned by redhat
CVE-2021-20267
High 7.1
In plain English
A high-severity insufficient verification of data authenticity in openstack-neutron. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 64% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | neutron | 2:17.1.1-5 | DEBIAN-CVE-2021-20267 |
| Debian:13 | neutron | 2:17.1.1-5 | DEBIAN-CVE-2021-20267 |
| Debian:14 | neutron | 2:17.1.1-5 | DEBIAN-CVE-2021-20267 |
| PyPI | neutron | 17.1.1 | GHSA-w8hx-f868-pvch |
| PyPI | neutron | 15.3.3, 16.3.1, 17.1.1 | PYSEC-2021-136 |
| PyPI | neutron | 16.3.1 | GHSA-w8hx-f868-pvch |
| PyPI | neutron | 15.3.3 | GHSA-w8hx-f868-pvch |
| Ubuntu:22.04:LTS | neutron | 2:20.3.0-0ubuntu1.1 | USN-6067-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | openstack-neutron | openstack-neutron 15.3.3, openstack-neutron 16.3.1, openstack-neutron 17.1.1 |
Weakness: CWE-345
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1934330 x_refsource_MISC
- https://security.openstack.org/ossa/OSSA-2021-001.html x_refsource_CONFIRM