CVE-2021-1228: Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2021-1228?
CVE-2021-1228 is considered high severity as it allows an unauthenticated, adjacent attacker to bypass security validations.
How do I fix CVE-2021-1228?
To fix CVE-2021-1228, upgrade to the latest version of Cisco NX-OS that addresses this vulnerability.
What Cisco products are affected by CVE-2021-1228?
CVE-2021-1228 affects Cisco Nexus 9000 Series Fabric Switches running specific versions of NX-OS, including 11.0(1b) through 14.x versions.
Can CVE-2021-1228 be exploited remotely?
No, CVE-2021-1228 can only be exploited by an adjacent attacker on the same local network.
What types of attacks can be performed using CVE-2021-1228?
An attacker exploiting CVE-2021-1228 can connect unauthorized servers to the network, potentially gaining access to sensitive information.