This indicates an attempt to exploit a vulnerability in SonicWALL's SSL-VPN Client.
This vulnerability is caused by an error in the "FileDelete" and "AddRouteEntry" methods in the "WebCacheCleaner" and "NELaunchCtrl" ActiveX Controls. It allows remote attackers to delete arbitrary files or execute arbitrary code via a crafted web page.
SonicWALL SSL-VPN 126.96.36.199
System Compromise: remote attackers can delete arbitrary files or execute arbitrary code.
Refer to the vendor's websit for suggested workround.