More software vulnerabilities exist in iOS compared to the other operating systems, and a SourceFire executive said this is due to the iPhone's popularity, and Apple's strictly controlled app store which drives cybercriminals to find vulnerabilities in the operating system instead.
According to SourceFire's "25 Years of Vulnerabilities" study released in early March, which analyzed vulnerabilities from the Common Vulnerabilities and Exposures (CVE) data and National Vulnerability Database (NVD), the majority of mobile phone vulnerabilities have been found in Apple's iPhone. The database provides 25 years of information on vulnerabilities to assess, spanning from 1988.
210 vulnerabilities were found in Apple's smartphone, giving iOS 81 percent of the mobile phone vulnerability market share. This is more than the total number of vulnerabilities in Android-based, Windows-based and BlackBerry-based smartphones combined, at 19 percent.
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http://www.zdnet.com/iphones-most-vulnerable-among-smartphones-7000013129/