Sequence of Events Vulnerability

A sequence of events vulnerability occurs when a protocol fails to correctly enforce the order of transactions, leading to unexpected state changes. In financial applications, the order in which trades are processed can determine whether a transaction is successful or if it causes a liquidation.

If the system cannot guarantee that events are recorded in the exact order they occurred, the integrity of the ledger is compromised. This is especially critical in complex derivatives where dependencies exist between multiple smart contract calls.

Attackers can exploit this by reordering transactions to manipulate the price or to ensure their own trade is processed first. Robust systems use cryptographic sequencing or strict causal ordering to prevent these exploits.

Failing to secure the sequence of events can lead to significant financial loss and loss of user trust in the protocol.