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Cisco Bug: CSCtc34281 - High CPU due to multiple applications listening on a share port

Last Modified

Nov 09, 2016

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases


Description (partial)

The ASA experiences high CPU when telnet, ssh, a static translation or any other configuration change is made that causes the ASA to listen to a given port.

This due to the ASA listening to multiple ports on the same interface. This can be seen if you were to configure a static translation for port 22 and enable ssh on the same interface. 

For example
static (inside,outside) tcp interface 22 x.x.x.x 22 netmask
ssh 0 0 outside

This can also be seen with aaa auth-proxy or any other application that causes the ASA to listen to a port that will show up in show asp table socket
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