Incident Overview
bEarn Fi is a cross-chain product in Decentralized Finance (DeFi) that at its core provides yield generation, algorithmic stablecoin, bridge, gaming aggregation, treasury, AMM DEX, and governance on multi-chain: Binance Smart Chain blockchain (BSC) and Ethereum blockchain.
Incident Report
Protocol Information
Market Context at Time of Hack
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.
What Auditors Should Check
If you're auditing a protocol with similar architecture to BearnFi, these are the critical security checks that could have prevented this incident (May 2021).
- Verify all logic paths related to Flashloan Withdraw Logic Exploit are guarded by proper access controls and input validation - see the Flash Loans 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
Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.
Free TrialRelated Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Proof-of-Concept Exploits
On-Chain Evidence & References
Sources & References
Learn to Prevent the Next BearnFi
The BearnFi hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.