VMware ESXi 4.0 through 5.1 and ESX 4.0 and 4.1 allow remote attackers to cause a denial of service (NULL pointer dereference) by intercepting and modifying Network File Copy (NFC) traffic. Per: http://cwe.mitre.org/data/definitions/476.html
"CWE-476: NULL Pointer Dereference"
Publication date: Sat, 18 Jan 2014 03:55:00 +0000