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Chapter 4
Smart Contract Vulnerabilities
The core of smart contract auditing — learn every major vulnerability class, understand how they work, and practice exploiting them. This chapter is what separates security researchers from developers.
Lessons
1
Reentrancy Attacks
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2
Access Control Vulnerabilities
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3
Integer Arithmetic Bugs
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4
Unchecked External Calls
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5
Denial of Service Attacks
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6
Front-Running & MEV
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7
Oracle Manipulation
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8
Flash Loan Attacks
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9
Signature Replay Attacks
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10
Randomness Vulnerabilities
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11
Delegatecall & Proxy Vulnerabilities
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12
Logic & Business Logic Bugs
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Chapter Quiz
Test your knowledge — answer 3 out of 5 questions correctly to pass.