--- title: Solving Damn Vulnerable DeFi V4: Level 7- Compromised description: A walkthrough of Level 7 (Compromised) from the Damn Vulnerable DeFi V4 CTF series. The challenge involves a DeFi NFT exchange whose price oracle relies on... canonical: https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-7--compromised-lgnp95eei twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Solving Damn Vulnerable DeFi V4: Level 7- Compromised | daily.dev og:description: A walkthrough of Level 7 (Compromised) from the Damn Vulnerable DeFi V4 CTF series. The challenge involves a DeFi NFT exchange whose price oracle relies on... og:url: https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-7--compromised-lgnp95eei og:image: https://api.daily.dev/og/posts/lGNp95eei.png og:image:alt: Solving Damn Vulnerable DeFi V4: Level 7- Compromised og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Solving Damn Vulnerable DeFi V4: Level 7- Compromised **[Coins Bench](https://daily.dev/sources/coinsbench)** · 3 min read · 0 upvotes · 0 comments ## Summary A walkthrough of Level 7 (Compromised) from the Damn Vulnerable DeFi V4 CTF series. The challenge involves a DeFi NFT exchange whose price oracle relies on three trusted sources. The exploit requires decoding leaked encoded data from the challenge page to recover two private keys belonging to compromised oracle reporter accounts. Using those keys, an attacker manipulates the NFT price to 1 wei, buys an NFT cheaply, then inflates the price to drain the exchange's full ETH balance by selling the NFT back. A complete Foundry test proof-of-concept is provided. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Solving Damn Vulnerable DeFi V4: Level 8- puppet](https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-8--puppet-ynzh0n5nf) · Coins Bench · 0 upvotes · 0 comments - [Solving Damn Vulnerable DeFi V4: Level 9- puppetV2](https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-9--puppetv2-prluwyee1) · Coins Bench · 0 upvotes · 0 comments - [Damn Vulnerable DeFi V4 Walkthrough: Challenges 1–18 Breakdown](https://daily.dev/posts/damn-vulnerable-defi-v4-walkthrough-challenges-1-18-breakdown-9z2j2aewv) · Coins Bench · 1 upvotes · 0 comments - [Solving Damn Vulnerable DeFi V4: Level 4- Side Entrance](https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-4--side-entrance-klhs1n1t1) · Coins Bench · 0 upvotes · 0 comments --- Tags: [#smart-contracts](https://daily.dev/tags/smart-contracts), [#nft](https://daily.dev/tags/nft), [#solidity](https://daily.dev/tags/solidity), [#defi](https://daily.dev/tags/defi) [View this post on daily.dev](https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-7--compromised-lgnp95eei) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Solving Damn Vulnerable DeFi V4: Level 7- Compromised","url":"https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-7--compromised-lgnp95eei","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/solving-damn-vulnerable-defi-v4-level-7--compromised-lgnp95eei"},"datePublished":"2026-07-18T21:40:44.841Z","dateModified":"2026-07-18T21:44:42.242Z","description":"A walkthrough of Level 7 (Compromised) from the Damn Vulnerable DeFi V4 CTF series. 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