Cisco Systems VPN Client IPSec Driver (CVPNDRVA.sys) 5.0.02.0090 allows local users to cause a denial of service (crash) by calling the 0x80002038 IOCTL with a small size value, which triggers memory corruption.

More... (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2008-0324)