Last Updated: 2012-01-27 09:52:03 UTC
by Mark Hofman (Version: 1)
In case you missed it there is a vulnerability in the CISCO Ironport telnet service. Details can be found here http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120126-ironport
To mitigate the risk (if you can't upgrade just yet) is to switch off telnet on the device and use SSH to manage it instead.