Apple’s MacOS operating system topped the charts for the number of security vulnerabilities disclosed during 2015, with Apple’s iOS mobile operating system coming second, according to CVE Details, which keeps track of publicly disclosed security vulnerabilities.
Perhaps surprisingly, Apple’s two operating systems had even more vulnerabilities than the much-maligned Adobe Flash Player, although the Common Vulnerabilities and Exposures (CVE) system table does not reflect the severity of the vulnerabilities.  

Software 
Vendor 
Type 
# of vulnerabilities 
MacOS X 
Apple 
Operating system 
384 
iOS
Apple 
Operating system 
375
Adobe Flash Player 
Adobe 
Application 
314
Air SDK & Compiler
Adobe 
Application 
246
Internet Explorer
Microsoft
Application
231
Chrome
Google
Application
187
Firefox
Mozilla Foundation 
Application
178
Windows Server 2012 
Microsoft 
Operating system 
155
Ubuntu Linux 
Canonical 
Operating system 
152
Windows 8.1 
Microsoft 
Operating system 
151

Even more surprising, perhaps, is that Microsoft’s operating systems had less than half the number of vulnerabilities reported as MacOS, with even Ubuntu Linux having more reported vulnerabilities than all of Microsoft’s operating systems, with the exception of Windows Server 2012. The Linux kernel, meanwhile, had some 77 CVE warnings issued during 2015.
Further down the table, Apple’s Apple TV application and WatchOS operating system also chalked up a relatively high number of CVE warnings, with 57 and 53 respectively. 

Organisation 
# of vulnerabilities 
Microsoft
1,561 
Adobe
1,504
Apple
1,147 
Oracle
370 
Google 
317 
Mozilla Foundation
301 
Canonical 
152 
Novell 
121 
Debian 
111 
Linux kernel
77
 
 
Overall, however, Microsoft topped the charts with a total of 1,561 vulnerabilities issued for Microsoft products, with Adobe not far behind with 1,504 and Apple in third with 1,147. 

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