What happens if fallback function in Etheruim invoked?

What happens if fallback function in Etheruim invoked?

We know in Etheruim if the function signature is not found, then a specific function without any parameter, known as fallback, is invocated. What happens if fallback function in Etheruim invoked? If this is a venerability or an exception ? An attacker how can use fallback function to attack ?

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