# Symmio, Staking and Vesting audit contest Sherlock · Staking · 7th March 2025 · #1 A public audit contest on Sherlock (staking), completed on 7th March 2025. 0xSimao placed #1. 2 of his findings are published: 2 medium. ## What Symmio, Staking and Vesting is Symmio is a permissionless OTC derivatives protocol and clearing layer. SYMM is its governance token, and the peripheral contracts around it handle staking, vesting and distribution. ## Scope The SYMM token's staking, vesting and distribution contracts. ## Medium severity findings - [Bad check in `Vesting.sol::_resetVestingPlans` will prevent users from adding additional liquidity in `SymmVesting.sol`](https://0xsimao.com/findings/symmio-staking-and-vesting-vesting-plans-additional-symm) - [Double spending attack in the Vesting contract](https://0xsimao.com/findings/symmio-staking-and-vesting-double-spending-attack-vesting) ## The contest [View the contest page](https://audits.sherlock.xyz/contests/838)