Cross-Chain Bridge Risk Assessment: MEXC

Target Protocol: MEXC (TVL: $5464.1M)

Technical Security & Risk Assessment: Cross-Chain Bridge Architecture

Target Entity / Context: MEXC / Cross-Chain Bridge Operations

Scope: Structural Threat Modeling, Smart Contract Security, Relayer Infrastructure, and Custodial Bridge Risks

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1. Executive Summary

Cross-chain bridges represent a primary attack vector in decentralized finance (DeFi) and centralized exchange (CEX) ecosystems due to their complex state synchronization requirements, multi-signature reliance, and asset locking mechanisms.

This assessment evaluates the architectural security posture typical of cross-chain bridging mechanisms integrated with or utilized by large entities like MEXC. The analysis focuses on smart contract integrity, validator network consensus, message-passing protocols, and liquidity management.

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2. Identified Attack Vectors & Threat Model

A. Smart Contract & Cryptographic Flaws

• Reentrancy and Logic Faults: Vulnerabilities within lock-and-mint or burn-and-unlock functions allowing arbitrary minting or draining of bridge vaults before state updates complete.
• Proof Verification Bypass: Flaws in Merkle tree verification or zero-knowledge proof verification logic enabling malicious actors to forge cross-chain transfer events.
• Signature Replay Attacks: Insufficient domain separators (e.g., missing chainId or

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