In fact, in 2014 it is OS X that was found to be riddled with the greatest number of security problems -- 147 in total, including 64 rated as high severity, and 67 as medium. Also from the Apple stables, iOS did not fare all that much better: 127 vulnerabilities including 32 high and 72 with a medium rating. The latest version of Windows -- Windows 8.1 -- was found to have 36 vulnerabilities, and its predecessors -- Windows 8 and 7 -- both had the same number.
Microsoft might celebrate coming ahead of Apple and Linux in one department, but Internet Explorer was found to be the most insecure web browser. IE had 242 vulnerabilities, compared to 124 in Chrome, and 117 in Firefox.
Top operating systems by vulnerabilities reported in 2014 as calculated by GFI.
Image courtesty of GFI