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Elevator - The Ethernaut - Writeup

Writeup for the Elevator level of the Ethernaut: reaching the top floor by returning different values from a malicious interface implementation.

  • Interfaces
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Saturday, May 2, 2026 | 2 minutes Read
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King - The Ethernaut - Writeup

Writeup for the King level of the Ethernaut: bricking the game with a contract that reverts on every incoming payment (denial of service).

  • Denial of Service
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Friday, April 24, 2026 | 3 minutes Read
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Re-entrancy - The Ethernaut - Writeup

Writeup for the Re-entrancy level of the Ethernaut: draining the contract's funds with a classic reentrancy attack on withdraw.

  • Reentrancy
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Friday, April 24, 2026 | 2 minutes Read
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Delegation - The Ethernaut - Writeup

Writeup for the Delegation level of the Ethernaut: hijacking ownership through a delegatecall in the contract's fallback function.

  • delegatecall
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Wednesday, April 22, 2026 | 2 minutes Read
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Force - The Ethernaut - Writeup

Writeup for the Force level of the Ethernaut: forcing ether into a contract with no payable function using selfdestruct.

  • selfdestruct
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Wednesday, April 22, 2026 | 2 minutes Read
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Telephone - The Ethernaut - Writeup

Writeup for the Telephone level of the Ethernaut: claiming ownership by abusing the difference between tx.origin and msg.sender.

  • tx.origin
  • Phishing
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Wednesday, April 22, 2026 | 2 minutes Read
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Token - The Ethernaut - Writeup

Writeup for the Token level of the Ethernaut: minting unlimited tokens through an unchecked integer underflow in transfer.

  • Integer Overflow
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Wednesday, April 22, 2026 | 2 minutes Read
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Vault - The Ethernaut - Writeup

Writeup for the Vault level of the Ethernaut: reading a private storage variable directly from the contract's storage slots.

  • Storage Layout
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Wednesday, April 22, 2026 | 2 minutes Read
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Coin Flip - The Ethernaut - Writeup

Writeup for the Coin Flip level of the Ethernaut: predicting the result by precomputing the blockhash-based pseudo-randomness.

  • Randomness
  • Blockhash
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Sunday, April 19, 2026 | 3 minutes Read
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Fal1out - The Ethernaut - writeup

Writeup for the Fallout level of the Ethernaut: taking ownership via a mistyped constructor that is just a regular public function.

  • Constructors
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Sunday, April 19, 2026 | 1 minute Read
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Fallback - The Ethernaut - writeup

Writeup for the Fallback level of the Ethernaut: claiming contract ownership through the receive/fallback function and draining its balance.

  • Fallback Functions
  • Ethernaut
  • Solidity
  • Smart Contracts
  • Ethereum
  • Web3
  • CTF
  • Writeup
Sunday, April 19, 2026 | 3 minutes Read
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