Denial of Service for Catalyst 6500 and 6800 Switch with Supervisor Engine 2T or 6T

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Date of Notice: 04/9/2024

Action Level - Critical


MCNC would like to make you aware of a new Denial of Service affecting the Catalyst 6500 and 6800 series switches with Supervisor Engine 2T or 6T when any of the following are enabled: port security; device classifier; or authentication, authorization, and accounting (AAA).

All previous versions of code are vulnerable to a crafted packet which can permit an attacker to force a reboot of the device, resulting in a Denial of Service.

Affected Devices

  • Catalyst 6500 Series Switches with Supervisor Engine 2T or 6T
  • Catalyst 6800 Series Switches with Supervisor Engine 2T or 6T

Attack Vector

Any attacker with network access that can send a packet to the given device could potentially exploit this vulnerability.

Attack Feasibility



There is no mitigation, you must apply Cisco’s free patch


Upgrade to Cisco’s newest released code.

Reference Links

Cisco Security Advisory

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