Buffer overflow in Cisco Unified CallManager (CUCM) 5.0(1) through 5.0(3a) allows remote attackers to execute arbitrary code via a long hostname in a SIP request, aka bug CSCsd96542.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27691
http://www.vupen.com/english/advisories/2006/2774
http://www.securityfocus.com/bid/18952
http://www.cisco.com/warp/public/707/cisco-sa-20060712-cucm.shtml