Cisco Intrusion Prevention System (IPS) Software allows remote attackers to cause a denial of service (MainApp process outage) via malformed SNMP packets, aka Bug IDs CSCum52355 and CSCul49309.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-2143
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-2103