Here is an article you will want to read about a bug flaw in an Intel chip that does affect all Mac and iOS devices:
<https://www.theverge.com/2018/1/4/16852016/apple-confirms-mac-ios-affected-spectre-meltdown-chipocalypse>
here are no known exploits yet, and Apple, Microsoft, Intel and Google (for the Chrome browser) will be issuing patches soon. In order for this exploit to affect a device, an app has to be downloaded and installed. So, until this bug is cleaned up, be very careful with what you install on your device.
Jim Hamm