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Cisco VLAN Trunking Protocol Vulnerability

I have got a cisco 2821 model router with a c2800nm-advipservicesk9-mz.151-2.T4 IOS, and was reported with 'Cisco VLAN Trunking Protocol Vulnerability'.

Though the device is in server mode, I do not have any domain name or trunk port configured.

 

Is my device really vulnerable? If yes, whats next?

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