3.3
CVSSv2

CVE-2021-1228

Published: 24/02/2021 Updated: 07/11/2023
CVSS v2 Base Score: 3.3 | Impact Score: 2.9 | Exploitability Score: 6.5
CVSS v3 Base Score: 6.5 | Impact Score: 3.6 | Exploitability Score: 2.8
VMScore: 294
Vector: AV:A/AC:L/Au:N/C:N/I:P/A:N

Vulnerability Summary

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 malicious user 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 malicious user 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.

Vulnerability Trend

Vulnerable Product Search on Vulmon Subscribe to Product

cisco nx-os 11.0\\(1b\\)

cisco nx-os 11.0\\(1c\\)

cisco nx-os 11.0\\(1d\\)

cisco nx-os 11.0\\(1e\\)

cisco nx-os 11.0\\(2j\\)

cisco nx-os 11.0\\(2m\\)

cisco nx-os 11.0\\(3f\\)

cisco nx-os 11.0\\(3i\\)

cisco nx-os 11.0\\(3k\\)

cisco nx-os 11.0\\(3n\\)

cisco nx-os 11.0\\(3o\\)

cisco nx-os 11.0\\(4g\\)

cisco nx-os 11.0\\(4h\\)

cisco nx-os 11.0\\(4o\\)

cisco nx-os 11.0\\(4q\\)

cisco nx-os 11.1\\(1j\\)

cisco nx-os 11.1\\(1o\\)

cisco nx-os 11.1\\(1r\\)

cisco nx-os 11.1\\(1s\\)

cisco nx-os 11.1\\(2h\\)

cisco nx-os 11.1\\(2i\\)

cisco nx-os 11.1\\(3f\\)

cisco nx-os 11.1\\(4e\\)

cisco nx-os 11.1\\(4f\\)

cisco nx-os 11.1\\(4g\\)

cisco nx-os 11.1\\(4i\\)

cisco nx-os 11.1\\(4l\\)

cisco nx-os 11.1\\(4m\\)

cisco nx-os 11.2\\(1i\\)

cisco nx-os 11.2\\(1k\\)

cisco nx-os 11.2\\(1m\\)

cisco nx-os 11.2\\(2g\\)

cisco nx-os 11.2\\(2h\\)

cisco nx-os 11.2\\(2i\\)

cisco nx-os 11.2\\(2j\\)

cisco nx-os 11.2\\(3c\\)

cisco nx-os 11.2\\(3e\\)

cisco nx-os 11.2\\(3h\\)

cisco nx-os 11.2\\(3m\\)

cisco nx-os 11.3\\(1g\\)

cisco nx-os 11.3\\(1h\\)

cisco nx-os 11.3\\(1i\\)

cisco nx-os 11.3\\(1j\\)

cisco nx-os 11.3\\(2f\\)

cisco nx-os 11.3\\(2h\\)

cisco nx-os 11.3\\(2i\\)

cisco nx-os 11.3\\(2j\\)

cisco nx-os 11.3\\(2k\\)

cisco nx-os 12.0\\(1m\\)

cisco nx-os 12.0\\(1n\\)

cisco nx-os 12.0\\(1o\\)

cisco nx-os 12.0\\(1p\\)

cisco nx-os 12.0\\(1q\\)

cisco nx-os 12.0\\(1r\\)

cisco nx-os 12.0\\(2f\\)

cisco nx-os 12.0\\(2g\\)

cisco nx-os 12.0\\(2h\\)

cisco nx-os 12.0\\(2l\\)

cisco nx-os 12.0\\(2m\\)

cisco nx-os 12.0\\(2n\\)

cisco nx-os 12.0\\(2o\\)

cisco nx-os 12.1\\(1h\\)

cisco nx-os 12.1\\(1i\\)

cisco nx-os 12.1\\(2e\\)

cisco nx-os 12.1\\(2g\\)

cisco nx-os 12.1\\(2k\\)

cisco nx-os 12.1\\(3g\\)

cisco nx-os 12.1\\(3h\\)

cisco nx-os 12.1\\(3j\\)

cisco nx-os 12.1\\(4a\\)

cisco nx-os 12.2\\(1k\\)

cisco nx-os 12.2\\(1n\\)

cisco nx-os 12.2\\(1o\\)

cisco nx-os 12.2\\(2e\\)

cisco nx-os 12.2\\(2f\\)

cisco nx-os 12.2\\(2i\\)

cisco nx-os 12.2\\(2j\\)

cisco nx-os 12.2\\(2k\\)

cisco nx-os 12.2\\(2q\\)

cisco nx-os 12.2\\(3j\\)

cisco nx-os 12.2\\(3p\\)

cisco nx-os 12.2\\(3r\\)

cisco nx-os 12.2\\(3s\\)

cisco nx-os 12.2\\(3t\\)

cisco nx-os 12.2\\(4f\\)

cisco nx-os 12.2\\(4p\\)

cisco nx-os 12.2\\(4q\\)

cisco nx-os 12.2\\(4r\\)

cisco nx-os 12.3\\(1e\\)

cisco nx-os 12.3\\(1f\\)

cisco nx-os 12.3\\(1i\\)

cisco nx-os 12.3\\(1l\\)

cisco nx-os 12.3\\(1o\\)

cisco nx-os 12.3\\(1p\\)

cisco nx-os 13.0\\(1k\\)

cisco nx-os 13.0\\(2h\\)

cisco nx-os 13.0\\(2k\\)

cisco nx-os 13.0\\(2n\\)

cisco nx-os 13.1\\(1i\\)

cisco nx-os 13.1\\(2m\\)

cisco nx-os 13.1\\(2o\\)

cisco nx-os 13.1\\(2p\\)

cisco nx-os 13.1\\(2q\\)

cisco nx-os 13.1\\(2s\\)

cisco nx-os 13.1\\(2t\\)

cisco nx-os 13.1\\(2u\\)

cisco nx-os 13.1\\(2v\\)

cisco nx-os 13.2\\(1l\\)

cisco nx-os 13.2\\(1m\\)

cisco nx-os 13.2\\(2l\\)

cisco nx-os 13.2\\(2o\\)

cisco nx-os 13.2\\(3i\\)

cisco nx-os 13.2\\(3j\\)

cisco nx-os 13.2\\(3n\\)

cisco nx-os 13.2\\(3o\\)

cisco nx-os 13.2\\(3r\\)

cisco nx-os 13.2\\(3s\\)

cisco nx-os 13.2\\(4d\\)

cisco nx-os 13.2\\(4e\\)

cisco nx-os 13.2\\(5d\\)

cisco nx-os 13.2\\(5e\\)

cisco nx-os 13.2\\(5f\\)

cisco nx-os 13.2\\(6i\\)

cisco nx-os 13.2\\(7f\\)

cisco nx-os 13.2\\(7k\\)

cisco nx-os 13.2\\(8d\\)

cisco nx-os 13.2\\(9b\\)

cisco nx-os 13.2\\(9f\\)

cisco nx-os 13.2\\(9h\\)

cisco nx-os 13.2\\(41d\\)

cisco nx-os 14.0\\(1h\\)

cisco nx-os 14.0\\(2c\\)

cisco nx-os 14.0\\(3c\\)

cisco nx-os 14.0\\(3d\\)

cisco nx-os 14.1\\(1i\\)

cisco nx-os 14.1\\(1j\\)

cisco nx-os 14.1\\(1k\\)

cisco nx-os 14.1\\(1l\\)

cisco nx-os 14.1\\(2g\\)

cisco nx-os 14.1\\(2m\\)

cisco nx-os 14.1\\(2o\\)

cisco nx-os 14.1\\(2s\\)

cisco nx-os 14.1\\(2u\\)

cisco nx-os 14.1\\(2w\\)

cisco nx-os 14.1\\(2x\\)

cisco nx-os 14.2\\(1i\\)

cisco nx-os 14.2\\(1j\\)

cisco nx-os 14.2\\(1l\\)

cisco nx-os 14.2\\(2e\\)

cisco nx-os 14.2\\(2f\\)

cisco nx-os 14.2\\(3j\\)

cisco nx-os 14.2\\(3l\\)

cisco nx-os 14.2\\(3n\\)

cisco nx-os 14.2\\(3q\\)

cisco nx-os 14.2\\(4i\\)

cisco nx-os 14.2\\(4k\\)

cisco nx-os 14.2\\(4o\\)

cisco nx-os 14.2\\(4p\\)

cisco nx-os 14.2\\(5k\\)

cisco nx-os 15.0\\(1k\\)

cisco nx-os 15.0\\(1l\\)

cisco nx-os 15.0\\(2h\\)

Vendor Advisories

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 insufficie ...