CVE-2017-6655: A vulnerability in the Fibre Channel over Ethernet (FCoE) protocol implementation in Cisco NX-OS Software c...

Security readout for executives and security teams

This flaw can crash an FCoE-related process on specific Cisco NX-OS platforms, causing a denial of service. It matters mainly where Nexus 7000/7700 or Multilayer Director Switches carry Fibre Channel over Ethernet traffic. The attacker must be adjacent, so exposure is usually inside the network fabric rather than internet-facing. Exposure is limited to the named Cisco NX-OS device families when FCoE is enabled. Organizations without FCoE on these platforms are unlikely to be affected based on the source bundle. Storage-network and data-center switching environments should treat this as operationally important. Prioritize if these switches support critical storage or data-center paths. The issue is not shown as actively exploited, but a fabric-level DoS can affect business availability. Patch during controlled maintenance after confirming FCoE exposure. Mitigation focus: Inventory Cisco NX-OS switches that run FCoE.; Confirm whether affected platforms match the Cisco advisory.; Upgrade to a Cisco-listed fixed release where applicable..

Prepared

Jun 13, 2026, 04:43 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.