Cardex Hack

TOTAL LOST $400K
Low Private Key Compromised (Session signer) abstract

Summarize with AI

ChatGPT Perplexity Claude Grok
Affected Chain abstract Incident surface
Recovered - No recovery reported
All-Time Rank #1043 By amount stolen
Auditors 1 Prior security audit

Incident Overview

Crodex is a decentralized exchange (DEX), providing liquidity and enabling peer-to-peer transactions on Cronos.

This is classified as a Access Control Attacks . Compare similar hacks →

Incident Report

Protocol / Project Cardex
Date of Incident
Affected Chain(s) abstract
Attack Technique Private Key Compromised (Session signer)
Classification Infrastructure
Primary Source View Post-Mortem

Protocol Information

Protocol Type Dexs
Smart Contract Language Solidity
Official Website swap.crodex.app
Protocol Twitter/X @crodexapp

Market Context at Time of Hack

Token Categories
Decentralized Exchange (DEX) Token DeFi Cronos Ecosystem
Protocol Links
GitHub Discord

What the Attacker Needed to Succeed

Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.

Technical Knowledge Operational-security tradecraft (phishing, malware, leaked seed phrases, or insider access) to obtain treasury signing authority
Capital Required Minimal capital - only enough to cover gas while draining the compromised accounts
On-Chain Access Valid signing authority over the compromised wallets / multisig signers, allowing direct transfer of funds or stake authorization
Target Reconnaissance Identification of Cardex's high-value treasury accounts and the authority / multisig structure controlling them
Execution Speed Speed to drain the compromised accounts before the team detects the breach and revokes signing authority or freezes the assets
Obfuscation Plan A strategy to launder and move stolen funds - typically through mixers, cross-chain bridges, or decentralized DEX swaps to resist tracing

What Auditors Should Check

Could this have been caught in audit? Hard to catch — private key / OpSec failures are outside smart contract audit scope
Audited by Audit Report 1 — still lost $400K. Prior audits don't guarantee safety, especially after post-audit code changes.

If you're auditing a protocol with similar architecture to Cardex, these are the critical security checks that could have prevented this incident (February 2025).

  • Verify all logic paths related to Private Key Compromised (Session signer) are guarded by proper access controls and input validation - see the Access Control Attacks attack class for patterns
  • Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs

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Security Audit History

Related Attack Classes

The technique used in this hack maps to these vulnerability classes in our security curriculum:

See all Access Control Attacks examples →

Access Control Attacks

Sources & References

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