The SSLVPN feature in Cisco IOS 12.3 through 12.4 allows remote attackers to cause a denial of service (device reload or hang) via a crafted HTTPS packet.
secunia.com/advisories/34438
securitytracker.com/id?1021896
www.cisco.com/en/US/products/products_security_advisory09186a0080a90424.shtml
www.cisco.com/en/US/products/products_security_advisory09186a0080a90469.shtml
www.securityfocus.com/bid/34239
www.vupen.com/english/advisories/2009/0851
exchange.xforce.ibmcloud.com/vulnerabilities/49425
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6919