NGSEC StackDefender 2.0 allows attackers to cause a denial of service (system crash) via an invalid address for the BaseAddress parameter to the hooks for the (1) ZwAllocateVirtualMemory or (2) ZwProtectVirtualMemory functions.
https://exchange.xforce.ibmcloud.com/vulnerabilities/16892
http://www.idefense.com/application/poi/display?id=119&type=vulnerabilities&flashstatus=false