CVE-2021-20267
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 2:17.1.1-5 |
| sid | Fixed | 2:17.1.1-5 |
| forky | Fixed | 2:17.1.1-5 |
| bullseye | Fixed | 2:17.1.1-5 |
| bookworm | Fixed | 2:17.1.1-5 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-20267
- https://bugzilla.redhat.com/show_bug.cgi?id=1934330
- https://github.com/openstack/neutron
- https://github.com/pypa/advisory-database/tree/main/vulns/neutron/PYSEC-2021-136.yaml
- https://security.openstack.org/ossa/OSSA-2021-001.html
- https://www.suse.com/security/cve/CVE-2021-20267.html
- https://security-tracker.debian.org/tracker/CVE-2021-20267
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.