Money is not at all safe in cryptocurrency, There are so many hackers around here who's only business is hack a wallet of bounty hunters to get money without doing anything.
Well, as we can see, there is a lot of vulnerability I can see in the private key and wallet that we use. for example, you can easily try to jumble your private key in myetherwallet, after this, when you enter your private key, you can open another account with its respective wallet address without ease. It is surely a vulnerability for me.