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Cisco fixed a vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco Nexus 9000 Series Application Centric Infrastructure (ACI) Mode Switch Software could allow an adjacent, unauthenticated attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges.

The vulnerability is a result of improper input validation of certain type, length, value (TLV) fields of the LLDP frame header.

An attacker could exploit this vulnerability by sending a crafted LLDP packet to the targeted device. A successful exploit may lead to a buffer overflow condition that could either cause a DoS condition or allow the attacker to execute arbitrary code with root privileges.

Cisco released software updates that address this vulnerability, according to the advisory. However, there are no workarounds.

Cyber Security

The vulnerability affects Cisco Nexus 9000 Series Fabric Switches in ACI mode if they are running a Cisco Nexus 9000 Series ACI Mode Switch Software release prior to 13.2(7f) or any 14.x release.

The vulnerability is fixed in Cisco Nexus 9000 Series ACI Mode Switch Software Release 13.2(7f). Cisco will also fix this vulnerability in a 14.1(2) maintenance release, scheduled for this month.

Cisco is not aware of any malicious use of the vulnerability.

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