The mDNS implementation in Cisco IOS XE 3.12S does not properly interact with autonomic networking, which allows remote attackers to obtain sensitive networking-services information by sniffing the network or overwrite networking-services data via a crafted mDNS response, aka Bug ID CSCun64867.
http://www.securitytracker.com/id/1030444
http://www.securityfocus.com/bid/68021
http://tools.cisco.com/security/center/viewAlert.x?alertId=34613
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-3290