Security incident · 2025-05-27
Usual USD0
According to the public DefiLlama incident dataset, Usual USD0 (Ethereum) suffered a security incident on 2025-05-27, with about $43K reported lost.
| Date | 2025-05-27 |
|---|---|
| Reported loss | $43K |
| Chain | Ethereum |
| Target type | DeFi Protocol |
| Technique class | Input Validation |
| Technique | Missing Input Validation |
| Bridge incident | No |
| Within 2025 | #131 by loss that year, 0.0% of all reported losses that year |
How this kind of attack works
The contract did not check the parameters it received, and the attacker passed crafted data that made it do something it should not.
Would a pre-payment check have helped
Missing input validation is a contract code defect for code audits.
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