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Cisco Security Advisory: After receiving eight TCP connection attempts using a non-standard TCP flags combination, a Catalyst switch will stop responding to further TCP connections to that particular service. In order to re-establish functionality of that service, the switch must be rebooted. CatOS for the following models is affected: 4000 Series including models 2948G and 2980G/2980G-A, 5000 Series including models 2901, 2902 and 2926, and the 6000.

Cisco Security Advisory: After receiving eight TCP connection attempts using a non-standard TCP flags combination, a Catalyst switch will stop responding to further TCP connections to that particular service. In order to re-establish functionality of that service, the switch must be rebooted. CatOS for the following models is affected: 4000 Series including models 2948G and 2980G/2980G-A, 5000 Series including models 2901, 2902 and 2926, and the 6000.