Cisco Nexus 1000V Virtual Ethernet Module (VEM) 4.0(4) SV1(1) through SV1(3b), as used in VMware ESX 4.0 and 4.1 and ESXi 4.0 and 4.1, does not properly handle dropped packets, which allows guest OS users to cause a denial of service (ESX or ESXi host OS crash) by sending an 802.1Q tagged packet over an access vEthernet port, aka Cisco Bug ID CSCtj17451.
https://exchange.xforce.ibmcloud.com/vulnerabilities/65217
http://www.vupen.com/english/advisories/2011/0315
http://www.vupen.com/english/advisories/2011/0314
http://www.vmware.com/security/advisories/VMSA-2011-0002.html
http://www.securityfocus.com/bid/46247
http://www.securityfocus.com/archive/1/516259/100/0/threaded
http://securitytracker.com/id?1025030
http://securityreason.com/securityalert/8090
http://secunia.com/advisories/43084
http://lists.vmware.com/pipermail/security-announce/2011/000118.html