he most common types of smart contract attacks and security flaws include:
Reentry attacks,
Integer overflow and underflow,
Timestamp dependence,
Frontrunning,
Denial of service (DoS) attacks.
These issues may crash your contract or allow hackers to steal money. It only takes a single bug or vulnerability to cause irreversible financial loss. Besides the loss of funds, your organization may suffer from a loss of trust from investors or clients.