Security incident · 2021-08-10
Poly Network
According to the public DefiLlama incident dataset, Poly Network (Ethereum, BSC, Polygon) suffered a security incident on 2021-08-10, with about $611.0M reported lost.
| Date | 2021-08-10 |
|---|---|
| Reported loss | $611.0M |
| Chain | Ethereum, BSC, Polygon |
| Target type | DeFi Protocol |
| Technique class | Access Control |
| Technique | Improper Access Control |
| Bridge incident | Yes |
| Within 2021 | #1 by loss that year, 21.3% of all reported losses that year |
How this kind of attack works
A contract function meant for administrators was not locked down, and the attacker called it directly to move funds.
Would a pre-payment check have helped
Broken contract permissions are a code-audit matter that pre-payment screening cannot see.
Other incidents with the same technique
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- BitGrail2018-02-12 · $170.0M
- Parity Multisig2017-11-09 · $150.0M
- Mirror2021-10-08 · $90.0M
- UPCX2025-04-01 · $70.0M
- Munchables2024-03-26 · $62.5M