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Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability

cisco-sa-n9kaci-unauth-access-5PWzDx2w · High · Published · Updated

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-unauth-access-5PWzDx2w This advisory is part of the February 2021 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: February 2021 Cisco FXOS and NX-OS Software Security Advisory Bundled Publication.

Cisco advisory ·CSAF JSON

Workarounds

There are no workarounds that address this vulnerability.

CVEsCVE-2021-1228
Cisco Bug IDsCSCvu84576
CVSS ScoreBase 7.4
Base 7.4 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N/E:X/RL:X/RC:X
Product Names From Source
Cisco NX-OS System Software in ACI Mode 13.2(1l), Cisco NX-OS System Software in ACI Mode 13.2(1m), Cisco NX-OS System Software in ACI Mode 13.2(2l), Cisco NX-OS System Software in ACI Mode 13.2(2o), Cisco NX-OS System Software in ACI Mode 13.2(3i), Cisco NX-OS System Software in ACI Mode 13.2(3n), Cisco NX-OS System Software in ACI Mode 13.2(3o), Cisco NX-OS System Software in ACI Mode 13.2(3r), Cisco NX-OS System Software in ACI Mode 13.2(4d), Cisco NX-OS System Software in ACI Mode 13.2(4e), Cisco NX-OS System Software in ACI Mode 13.2(3j), Cisco NX-OS System Software in ACI Mode 13.2(3s), Cisco NX-OS System Software in ACI Mode 13.2(5d), Cisco NX-OS System Software in ACI Mode 13.2(5e), Cisco NX-OS System Software in ACI Mode 13.2(5f), Cisco NX-OS System Software in ACI Mode 13.2(6i), Cisco NX-OS System Software in ACI Mode 13.2(41d), Cisco NX-OS System Software in ACI Mode 13.2(7f), Cisco NX-OS System Software in ACI Mode 13.2(7k), Cisco NX-OS System Software in ACI Mode 13.2(9b), Cisco NX-OS System Software in ACI Mode 13.2(8d), Cisco NX-OS System Software in ACI Mode 13.2(9f), Cisco NX-OS System Software in ACI Mode 13.2(9h), Cisco NX-OS System Software in ACI Mode 14.0(1h), Cisco NX-OS System Software in ACI Mode 14.0(2c), Cisco NX-OS System Software in ACI Mode 14.0(3d), Cisco NX-OS System Software in ACI Mode 14.0(3c), Cisco NX-OS System Software in ACI Mode 14.1(1i), Cisco NX-OS System Software in ACI Mode 14.1(1j), Cisco NX-OS System Software in ACI Mode 14.1(1k), Cisco NX-OS System Software in ACI Mode 14.1(1l), Cisco NX-OS System Software in ACI Mode 14.1(2g), Cisco NX-OS System Software in ACI Mode 14.1(2m), Cisco NX-OS System Software in ACI Mode 14.1(2o), Cisco NX-OS System Software in ACI Mode 14.1(2s), Cisco NX-OS System Software in ACI Mode 14.1(2u), Cisco NX-OS System Software in ACI Mode 14.1(2w), Cisco NX-OS System Software in ACI Mode 14.1(2x), Cisco NX-OS System Software in ACI Mode 14.2(1i), Cisco NX-OS System Software in ACI Mode 14.2(1j), Cisco NX-OS System Software in ACI Mode 14.2(1l), Cisco NX-OS System Software in ACI Mode 14.2(2e), Cisco NX-OS System Software in ACI Mode 14.2(2f), Cisco NX-OS System Software in ACI Mode 14.2(2g), Cisco NX-OS System Software in ACI Mode 14.2(3j), Cisco NX-OS System Software in ACI Mode 14.2(3l), Cisco NX-OS System Software in ACI Mode 14.2(3n), Cisco NX-OS System Software in ACI Mode 14.2(3q), Cisco NX-OS System Software in ACI Mode 14.2(4i), Cisco NX-OS System Software in ACI Mode 14.2(4k), Cisco NX-OS System Software in ACI Mode 14.2(4o), Cisco NX-OS System Software in ACI Mode 14.2(4p), Cisco NX-OS System Software in ACI Mode 14.2(5k), Cisco NX-OS System Software in ACI Mode 15.0(1k), Cisco NX-OS System Software in ACI Mode 15.0(1l), Cisco NX-OS System Software in ACI Mode 15.0(2e), Cisco NX-OS System Software in ACI Mode 15.0(2h), Cisco NX-OS System Software in ACI Mode, Cisco Nexus 9000 Series Switches

CSAF Product Statuses

Product Status Source CVE Rows
Cisco NX-OS System Software in ACI Mode 13.2(1l) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(1m) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(2l) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(2o) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(3i) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(3j) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(3n) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(3o) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(3r) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(3s) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(41d) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1
Cisco NX-OS System Software in ACI Mode 13.2(4d) when installed on Cisco Nexus 9000 Series Switches known_affected cisco_csaf CVE-2021-1228 1

Showing 12 of 57 CSAF status groups; 45 more not shown.

Related Products

Product CVE Evidence
Cisco NX-OS Software CVE-2021-1228 Cisco OpenVuln
Cisco NX-OS System Software in ACI Mode CVE-2021-1228 Cisco OpenVuln
Cisco Nexus 9000 Series Switches CVE-2021-1228 Cisco OpenVuln · family-level