These are the least secure Operating 
Systems in 2014 as measured by the National Vulnerability Database (NVD). As usual, Apple is way ahead of the pack in being the worst in security:
| Operating system | # of vulnerabilities | # of HIGH vulnerabilities | # of MEDIUM vulnerabilities | # of LOW vulnerabilities |
| 1- Apple Mac OS X | 147 | 64 | 67 | 16 |
| 2- Apple iOS | 127 | 32 | 72 | 23 |
| 3- Linux Kernel | 119 | 24 | 74 | 21 |
| 4- Microsoft Windows Server 2008 | 38 | 26 | 12 | 0 |
| 5- Microsoft Windows 7 | 36 | 25 | 11 | 0 |
| 6- Microsoft Windows Server 2012 | 38 | 24 | 14 | 0 |
| 7- Microsoft Windows 8 | 36 | 24 | 12 | 0 |
| 8- Microsoft Windows 8.1 | 36 | 24 | 12 | 0 |
| 9- Microsoft Windows Vista | 34 | 23 | 11 | 0 |
| 10- Microsoft Windows RT | 30 | 22 | 8 | 0 |
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