The security of a server depend 99% in the current system administrator/ security policies and a mere 1% in the operating system.
For example :lets think about a linux server that host a single webpage, this webpage will allow to upload pictures but by a mistake the programmer did miss to put a extension filter in the upload process. Even a script kiddie can utilize this vulnerability (uploading a perl file for example) to hack the system and convert it as a zombie. In my case i saw it and even a perl running as a permission-less process (as nobody) can hurt the system.
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