Vulnerability Description
A vulnerability in the fabric infrastructure VLAN connection establishment of Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN. This vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a crafted LLDP packet on the adjacent subnet to an affected device. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cisco | Nx-Os | 11.0\(1b\) |
| Cisco | Nexus 9000V | - |
| Cisco | Nexus 92160Yc-X | - |
| Cisco | Nexus 92300Yc | - |
| Cisco | Nexus 92304Qc | - |
| Cisco | Nexus 92348Gc-X | - |
| Cisco | Nexus 9236C | - |
| Cisco | Nexus 9272Q | - |
| Cisco | Nexus 93108Tc-Ex | - |
| Cisco | Nexus 93108Tc-Ex-24 | - |
| Cisco | Nexus 93108Tc-Fx | - |
| Cisco | Nexus 93108Tc-Fx-24 | - |
| Cisco | Nexus 93120Tx | - |
| Cisco | Nexus 93128Tx | - |
| Cisco | Nexus 9316D-Gx | - |
| Cisco | Nexus 93180Lc-Ex | - |
| Cisco | Nexus 93180Yc-Ex | - |
| Cisco | Nexus 93180Yc-Ex-24 | - |
| Cisco | Nexus 93180Yc-Fx | - |
| Cisco | Nexus 93180Yc-Fx-24 | - |
Related Weaknesses (CWE)
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nVendor Advisory
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nVendor Advisory
FAQ
What is CVE-2021-1228?
CVE-2021-1228 is a vulnerability with a CVSS score of 7.4 (HIGH). A vulnerability in the fabric infrastructure VLAN connection establishment of Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, a...
How severe is CVE-2021-1228?
CVE-2021-1228 has been rated HIGH with a CVSS base score of 7.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-1228?
Check the references section above for vendor advisories and patch information. Affected products include: Cisco Nx-Os, Cisco Nexus 9000V, Cisco Nexus 92160Yc-X, Cisco Nexus 92300Yc, Cisco Nexus 92304Qc.