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  3. /Zero-Day Exploit
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blockchain

Zero-Day Exploit

A previously unknown vulnerability that attackers discover and exploit before developers know it exists or can patch it.

Definition

A previously unknown vulnerability that attackers discover and exploit before developers know it exists or can patch it. In crypto, zero-day exploits in smart contracts can drain millions before anyone realizes what happened. This is why bug bounties and multiple audits are so important for DeFi protocols.

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Related Terms

Smart Contract Audit

A professional security review of smart contract code to find vulnerabilities before deployment.

Reentrancy Attack

A smart contract vulnerability where an attacker calls back into the vulnerable contract before the first function call finishes, draining funds repeatedly.

Bounty

A reward offered by crypto projects for completing specific tasks like finding bugs, writing code, or creating content.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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Ethereum Guide/learn/ethereumSecurity Guide/learn/security

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