Leaderboard
06All-time rank
Poly Network
Aug 10, 2021
$611M
Lost
$611M
Recovered
$0
Net loss
$611M
Unrecovered0% recovered
Poly Network was exploited for $611M on August 10, 2021 across Ethereum ($273M), BSC ($253M) and Polygon ($85M) via an access control and cryptography vulnerability in cross-chain bridge contracts. The attacker voluntarily returned nearly all funds within 15 days, keeping only transaction fees.
How the exploit worked
View reproducible PoCBridge, getting around modifier through cross-chain message.
Lost: $611 million
Source: DeFiHackLabs (SunWeb3Sec)
- Target
- Bridge
- Classification
- Access Control
- Technique
- Improper Access Control
- Attribution
- Unknown
- Chains
EthereumBSCPolygon
Event timeline
- Aug 10, 2021Exploit executed — $611M drained via improper access control
- Attributed to Unknown
- Recovery status Unrecovered 0%
Data credits
- DefiLlamaIncident record, amounts, chains, recovery data and logo
- DeFiHackLabsExploit analysis and reproducible proof-of-concept (by SunWeb3Sec)