Customers Without Service ContractsĬustomers who purchase directly from Cisco but do not hold a Cisco service contract and customers who make purchases through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should obtain upgrades by contacting the Cisco TAC:Ĭustomers should have the product serial number available and be prepared to provide the URL of this advisory as evidence of entitlement to a free upgrade. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers. In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts page, to determine exposure and a complete upgrade solution.
Free security software updates do not entitle customers to a new software license, additional software feature sets, or major revision upgrades. In most cases this will be a maintenance upgrade to software that was previously purchased. By installing, downloading, accessing, or otherwise using such software upgrades, customers agree to follow the terms of the Cisco software license:Īdditionally, customers may only download software for which they have a valid license, procured from Cisco directly, or through a Cisco authorized reseller or partner.
Customers may only install and expect support for software versions and feature sets for which they have purchased a license. This advisory is available at the following link:Ĭisco has released free software updates that address the vulnerability described in this advisory. There are no workarounds that address this vulnerability. In addition, the attack surface for this vulnerability can be greatly reduced by disabling LLDP on interfaces where it is not required.Ĭisco has released software updates that address this vulnerability. Note: This vulnerability cannot be exploited by transit traffic through the device the crafted packet must be targeted to a directly connected interface.
Designed to be intuitive, the network can recognize intent, mitigate threats through segmentation and encryption, and learn and change over time. The network can now learn, adapt, and evolve. 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 Catalyst 9000 Switching Family The Cisco® Catalyst® 9000 family of campus LAN switches is designed for an entirely new era of networking. An attacker could exploit this vulnerability by sending a crafted LLDP packet to the targeted device. The vulnerability is due to improper input validation of certain type, length, value (TLV) fields of the LLDP frame header. 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.