Cisco Cisco IOS Software Release 12.2(55)SE

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The switch stops working when you enter the show epm session summary privileged EXEC 
command.

There is no workaround. 

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In a single connection-enabled Terminal Access Controller Access Control System (TACACS) 
server, when the primary TACACS server goes down , the authentication fallback to the secondary 
server fails.

The workaround is to disable the single connection.

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The switch stops working even after a successful 802.1x authentication of the client.

There is no workaround.

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A port configured and authenticated with 802.1x security may not correctly detect a loop even if the 
Bridge Protocol Data Unit (BPDU) guard is configured on the interface. This may result in 100 
percent CPU utilization because of the Spanning Tree Protocol (STP) process of the switch.

The workaround is to configure the switch with the authentication open or authentication 
mac-move permit command.

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The switch reloads unexpectedly due to segV exception while making PBR configuration changes.

There is no workaround.

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Traffic that should be dropped or denied by an Access Control List (ACL) is permitted by the switch.

The workaround is to remove and reapply the ACL.

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When a switch is configured for SNMP and receives SNMP packets from an authenticated user, a 
successful exploitation causes the affected device to reload. This vulnerability could be exploited 
repeatedly to cause an extended Denial of Service (DoS) condition.

There is no workaround.

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Advanced Access Control List (dACL) does not get applied to a switch interface configured for 
Multi-Domain Authentication (MDA).

The workaround is to modify the dACL name and configuration.

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ARP is blocked with open authentication-enabled switchports.

The workaround is to run the command clear authentication session.

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