Unspecified vulnerability in Cisco NX-OS before 4.0(1a)N2(1), when running on Nexus 5000 platforms, allows remote attackers to cause a denial of service (crash) via an unspecified "sequence of TCP packets" related to "TCP State manipulation," possibly related to separate attacks against CVE-2008-4609.
http://www.securitytracker.com/id?1022847
http://www.cisco.com/en/US/products/products_security_advisory09186a0080af511d.shtml