http://www.h-online.com/security/news/item/Internet-Explorer-security-examined-1721876.html
Internet Explorer security examined
Security expert Brian Krebs has illustrated how different statistical approaches can provide differing perspectives on browser security. For example, if you simply count vulnerabilities, Internet Explorer compares well with its competitors. If, on the other hand, you look only at vulnerabilities which are actually exploited, Internet Explorer fares comparatively poorly, says Krebs.
Krebs calculates that 275 vulnerabilities were reported for Google Chrome in 2011, 97 for Mozilla Firefox, and only 45 for Internet Explorer. Using this method, Internet Explorer appears to be have a solid security story. However, looking at the statistics for zero day exploits actually spread by malicious web sites, Internet Explorer ranks far behind other browsers.
