---
title: "Discussion on \"The Ethernaut CTF Solutions | 19 - Alien Codex\" | Hashnode"
description: "Discussion on \"The Ethernaut CTF Solutions | 19 - Alien Codex\". Exploiting Arrays: How Underflow Leads to Ownership in the Alien Codex Challenge"
url: "https://hashnode.com/posts/the-ethernaut-ctf-solutions-19-alien-codex/662737c49677c575e4db2cfd"
---

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# [The Ethernaut CTF Solutions | 19 - Alien Codex](https://blog.pedrojok.com/the-ethernaut-ctf-solutions-19-alien-codex?utm_source=hashnode&utm_medium=feed)

Exploiting Arrays: How Underflow Leads to Ownership in the Alien Codex Challenge

Mar 31, 2024 · 4 min read · blog.pedrojok.com  
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-   [#ethereum-smart-contracts](https://hashnode.com/tag/ethereum-smart-contracts)
-   [#ethernaut](https://hashnode.com/tag/ethernaut)
-   [#ethereum-security](https://hashnode.com/tag/ethereum-security)
-   [#solidity](https://hashnode.com/tag/solidity)
-   [#security](https://hashnode.com/tag/security)
-   [#ctf](https://hashnode.com/tag/ctf)
-   [#web3-security](https://hashnode.com/tag/web3-security)

## Written by

[Pierre E.](https://hashnode.com/@Pedrojok)

@Pedrojok · Thailand

  
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Solidity Developer / Blockchain Developer

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