Unspecified vulnerability in Cisco IOS 12.2XNA, 12.2XNB, 12.2XNC, 12.2XND, 12.4MD, 12.4T, 12.4XZ, and 12.4YA allows remote attackers to cause a denial of service (device reload) via a crafted NTPv4 packet, aka Bug IDs CSCsu24505 and CSCsv75948.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6712
http://www.vupen.com/english/advisories/2009/2759
http://www.securitytracker.com/id?1022930
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af8131.shtml
http://tools.cisco.com/security/center/viewAlert.x?alertId=18889