According to the vulnerability statistics from CERT in 1990, we averaged fewer than 25 unique instances of malware per month at that time. With that low run rate of vulnerabilities, security companies could easily keep up creating defensive signatures for signature based Anti Virus (AV) to defend network environments. Today, as we approach 2011, we are seeing more than 1,500,000 individual instances of malware every month. Do the math – the growth rate is nearly incomprehensible.