Gnosis Safe

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08 June 2021
Live since
KYC required
Maximum bounty

Program Overview

Gnosis builds new market mechanisms for decentralized finance. Their three interoperable product lines allow you to securely create, trade, and hold digital assets on Ethereum.

Gnosis is running a bug bounty program focused on the SafeBridge module, which allows for execution of transactions initiated by a designated address on the other side of a designated arbitrary message bridge (AMB). This module is intended to be used with the Gnosis Safe.

For more information about Gnosis Safe, please visit For more information about Gnosis overall, please visit

This bug bounty program is focused around its smart contracts and the prevention of the loss of user funds.

Rewards by Threat Level

Rewards for Smart Contract vulnerabilities are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System. This is a simplified 5-level scale, with separate scales for websites/apps and smart contracts/blockchains, encompassing everything from consequence of exploitation to privilege required to likelihood of a successful exploit.

In order to be eligible for a reward, bug reports must include an explanation of how the bug can be reproduced, a failing test case, a valid scenario in which the bug can be exploited. If a fix that makes the test case pass is provided, an additional USD 4 000 is provided for critical vulnerabilities, for a maximum reward of USD 54 000.

Payouts are handled by the Gnosis team directly and are denominated in USD. However, payouts are done in DAI, GNO, or ETH, at the preference of the bug bounty hunter.

Smart Contracts and Blockchain

USD $50,000 - USD $54,000
USD $10,000
USD $2,000

Assets in Scope

Though the whole SafeBridge repo can be referenced, only the smart contract in this table is considered as within scope of the bug bounty program.

Prioritized Vulnerabilities

We are especially interested in receiving and rewarding vulnerabilities of the following types:

  • Re-entrancy
  • Logic errors
    • including user authentication errors
  • Solidity/EVM details not considered
    • including integer over-/under-flow
    • including unhandled exceptions
  • Trusting trust/dependency vulnerabilities
    • including composability vulnerabilities
  • Oracle failure/manipulation
  • Novel governance attacks
  • Economic/financial attacks
    • including flash loan attacks
  • Congestion and scalability
    • including running out of gas
    • including block stuffing
    • including susceptibility to frontrunning
  • Consensus failures
  • Cryptography problems
    • Signature malleability
    • Susceptibility to replay attacks
    • Weak randomness
    • Weak encryption
  • Susceptibility to block timestamp manipulation
  • Missing access controls / unprotected internal or debugging interfaces

Out of Scope & Rules

The following vulnerabilities are excluded from the rewards for this bug bounty program:

  • Attacks that the reporter has already exploited themselves, leading to damage
  • Attacks requiring access to leaked keys/credentials
  • Attacks requiring access to privileged addresses (governance, strategist)
  • Incorrect data supplied by third party oracles
    • Not to exclude oracle manipulation/flash loan attacks
  • Basic economic governance attacks (e.g. 51% attack)
  • Lack of liquidity
  • Best practice critiques
  • Sybil attacks

The following activities are prohibited by this bug bounty program:

  • Any testing with mainnet or public testnet contracts; all testing should be done on private testnets
  • Any testing with pricing oracles or third party smart contracts
  • Attempting phishing or other social engineering attacks against our employees and/or customers
  • Any testing with third party systems and applications (e.g. browser extensions) as well as websites (e.g. SSO providers, advertising networks)
  • Any denial of service attacks
  • Automated testing of services that generates significant amounts of traffic
  • Public disclosure of an unpatched vulnerability in an embargoed bounty
  • Interacting with accounts that you do not own