How Can an Attacker Force an External Call to Return False without Reverting?
An attacker can force an external call to return false without reverting the caller's transaction by having their malicious contract's fallback function consume all the gas forwarded by the call. If the call forwards a large amount of gas, the malicious contract can simply loop until it hits the gas limit.
The external call fails and returns false , but the calling contract might not revert if it doesn't check the return value.
Glossar
External Call
Interaction ⎊ This describes a smart contract's necessary communication with an entity outside its immediate execution environment, most commonly an oracle network to fetch real-world asset prices or event outcomes.
Return
Yield ⎊ Return, within cryptocurrency and derivatives, quantifies the profit or loss realized on an investment relative to its cost, often expressed as a percentage or ratio, and is fundamental to evaluating strategy performance.