Incident All ledgers
Parity: $30.0m
Parity lost $30.0m on 1 July 2017. Ranked 102nd of 1,272 crypto failures, with method, returned funds and comparable incidents.
- Date
- 1 July 2017
- Lost
- $30.0m
- Returned or repaid
- None recorded
- Target
- Wallet
- Category
- Access Control
- Method
- Uninitialized Proxy
- Chains
- Ethereum
In July 2017, a flaw in Parity's multisig wallet library let an attacker take over wallets and drain about 153,037 ETH (~$30M) belonging to Swarm City, Edgeless, and Aeternity. A white-hat group then used the same flaw to secure roughly $166M in other exposed wallets.
Against the ledger
- It ranks 102nd of the 1,272 incidents with a known loss, and 4th in 2017.
- It accounts for 79.6% of the $37.7m in known losses in July 2017.
- 225 incidents in the ledger are classified as Access Control, for $1.96bn in total. This one is 1.5% of that.
- The ledger records no returned funds.
Other incidents named Parity
| Date | Target | Lost | Type | Method | Returned |
|---|---|---|---|---|---|
| 09 Nov 2017 | Parity Multisig | $150.0m | DeFi Protocol | Uninitialized Proxy | — |
Closest in size by the same method
| Date | Target | Lost | Type | Method | Returned |
|---|---|---|---|---|---|
| 25 Mar 2019 | Coinbene | $40.0m | CEX | Improper Access Control | — |
| 10 Jun 2018 | Coinrail | $37.2m | CEX | Improper Access Control | — |
| 05 Jun 2022 | Wintermute | $17.6m | DeFi Protocol | Improper Access Control | — |
| 25 Mar 2024 | Curio | $16.0m | DeFi Protocol | Delegatecall Hijack | — |
| 27 May 2026 | SUPERFORTUNE AI | $15.2m | Token | Improper Access Control | — |
All failures in those years · 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, “Parity, failures ledger”, data to 2 November 2026, https://bitminer.io/ledger/incident/parity-2017-07-01/. How this is built