Can a Contract without a Fallback Function Still Participate in a Reentrancy Attack?
A contract without a fallback or a receive function cannot receive plain Ether, but it can still participate in a reentrancy attack if the attack is initiated through a specific, existing public function. However, if the vulnerable contract sends Ether using transfer or send , the transaction will revert immediately if the malicious contract has no payable function to receive it, effectively preventing the typical reentrancy loop.
Glossar
Reentrancy Attack
Exploit ⎊ The reentrancy attack, a critical vulnerability in smart contracts and financial systems, leverages recursive function calls to circumvent intended security protocols.
Fallback Function
Contingency ⎊ A fallback function within cryptocurrency derivatives serves as a pre-defined operational protocol activated when primary system components, such as oracles or clearinghouses, experience disruptions or fail to deliver expected data or execution.