Multiple unspecified vulnerabilities in the SSH server in Cisco IOS 12.4 allow remote attackers to cause a denial of service (device restart) via unknown vectors, aka Bug ID (1) CSCsk42419, (2) CSCsk60020, and (3) CSCsh51293.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5486
https://exchange.xforce.ibmcloud.com/vulnerabilities/42563
http://www.vupen.com/english/advisories/2008/1605/references
http://www.securityfocus.com/bid/29314
http://www.cisco.com/en/US/products/products_security_advisory09186a008099567f.shtml