If you allow ssh connections from outside of your local network (or even if you don't but you have left IPv6 enabled) then you probably should visit these links:Users of Raspberry Pi mini computers could be exposed to security issues due to a vulnerability in the operating system. The so-called vulnerability, as a developer has pointed out, leads the device to generate predictable secure shell (SSH) keys. Raspberry Pi Ltd confirmed the aforementioned limitation in Raspbian to us, and said that it is likely to fix that in a future release
Link 1 - Gadgets 360
Link 2 - Reddit
For RasPBX users, see: https://sourceforge.net/p/raspbx/discus ... /a4ce6043/
The Fix: Update RasPBX using "apt-get update && apt-get dist-upgrade", once complete you will have a new script available called "regen-hostkeys" which once run will fix the issue.
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