Fake Vesting events could be generated in SecondSwap_VestingDeployer::createVesting() and SecondSwap_VestingDeployer::createVestings() as there is no check of the stepVesting address is actually a real deployed one.
As you can see in the following functions, there is no check if the _stepVesting actually exists or not:
createVesting
and 
createVestings
Add a mapping of deployed stepvesting addresses to check if the address sent while creating a vesting actually exists or not.
