These are the least secure Operating
| 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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