# Smart Contract Security Exploits - tl;dr

## Overview

## What Does This Mean?

## How Does This Work?

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## Reentrancy

### Vulnerability

### Preventative Techniques

### Real-world Example: The DAO

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## Arithmetic Over/Underflows

### Vulnerability

### Preventative Techniques

### Real-world Example: PoWHC and Batch Transfer Overflow (CVE-2018–10299)

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## Unexpected Ether

### Vulnerability

### Preventative Techniques

### Real-world Example: various

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## DELEGATECALL opcode

### Vulnerability

### Preventative Techniques

### Real-world Example: Parity Multisig Wallet (Second Hack)

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## Default Visibilities

### Vulnerability

### Preventative Techniques

### Real-world Example: Parity Multisig Wallet (First Hack)

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## Entropy Illusion

### Vulnerability

### Preventative Techniques

### Real-world Example: PRNG Contracts

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## External Contract Referencing

### Vulnerability

### Preventative Techniques

### Real-world Example: Reentrancy Honey Pot

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## Short Address/Parameter Attack

### Vulnerability

### Preventative Techniques

### Real-world Example:

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## Unchecked CALL Return Values

### Vulnerability

### Preventative Techniques

### Real-World Example: Etherpot and King of the Ether

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## Race Conditions/Front Running

### Vulnerability

### Preventative Techniques

### Real-World Example: ERC20 and Bancor

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## Denial of Service (DoS)

### Vulnerability

### Preventative Techniques

### Real-World Example: GovernMental

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## Block Timestamp Manipulation

### Vulnerability

### Preventative Techniques

### Real-World Example: GovernMental

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## Constructors with Care

### Vulnerability

### Preventative Techniques

### Real-World Example: Rubixi

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## Uninitialized Storage Pointers

### Vulnerability

### Preventative Techniques

### Real-World Example: OpenAddressLottery and CryptoRoulette Honey Pots

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## Floating Point and Precision

### Vulnerability

### Preventative Techniques

### Real-World Example: Ethstick

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## Tx.Origin Authentication

### Vulnerability

### Preventative Techniques

### Real-World Example:

## Conclusions

###### tags: `tldr` `content`