Incident All ledgers
Ronin Bridge: $12.0m
Ronin Bridge lost $12.0m on 6 August 2024. Ranked 174th of 1,272 crypto failures, with method, returned funds and comparable incidents.
- Date
- 6 August 2024
- Lost
- $12.0m
- Returned or repaid
- None recorded
- Target
- DeFi Protocol
- Category
- Access Control
- Method
- Uninitialized Proxy
- Chains
- Ethereum
In August 2024, Ronin Bridge lost about $12M in ETH and USDC after an incomplete contract upgrade skipped a required initialization step, leaving operator vote-weight checks broken.
Against the ledger
- It ranks 174th of the 1,272 incidents with a known loss, and 22nd in 2024.
- It accounts for 62.7% of the $19.1m in known losses in August 2024.
- 225 incidents in the ledger are classified as Access Control, for $1.96bn in total. This one is 0.6% of that.
- The ledger records no returned funds.
Other incidents named Ronin
| Date | Target | Lost | Type | Method | Returned |
|---|---|---|---|---|---|
| 23 Mar 2022 | Ronin Bridge | $624.0m | DeFi Protocol | Validator Key Compromised | — |
Closest in size by the same method
| Date | Target | Lost | Type | Method | Returned |
|---|---|---|---|---|---|
| 27 Feb 2021 | Furucombo | $14.0m | DeFi Protocol | Delegatecall Hijack | — |
| 28 May 2025 | Cork V1 | $12.0m | DeFi Protocol | Improper Access Control | — |
| 22 Sept 2025 | UXLINK | $11.3m | DeFi Protocol | Delegatecall Hijack | — |
| 02 Jun 2019 | Kraken | $10.4m | CEX | Improper Access Control | — |
| 08 May 2021 | Rari Capital | $10.0m | DeFi Protocol | Arbitrary External Call | — |
All failures in 2024 · The failures ledger
Amounts are DefiLlama’s estimates and can change as incidents are revalued. Its returned figure can include money a company repaid itself, not only funds recovered from attackers. Source: DefiLlama.
Cite this Bitminer.io, “Ronin Bridge, failures ledger”, data to 2 November 2026, https://bitminer.io/ledger/incident/ronin-bridge-2024-08-06/. How this is built