Fei Protocol TRIBE Buybacks

Submit a Bug
19 October 2021
Live since
KYC required
Maximum bounty

Program Overview

The goal of the Fei Protocol is to generate the FEI stablecoin and grow its utility through integrations. Fei Protocol achieves this using Protocol Controlled Value to actively market make and defend the peg throughout DeFi.

Governance can add and update DEX integrations and other incentives as needed, which uses the TRIBE governance token.

In addition to their primary bug bounty program, Fei Protocol is running a special bug bounty program focused on their TRIBE Buybacks prelaunch. Unlike their primary bug bounty program, rewards for High Vulnerabilities are up to USD 50 000 and for Critical Vulnerabilities up to USD 200 000.

For more information about their primary bug bounty program, please visit https://immunefi.com/bounty/feiprotocol/.

For more information about the TRIBE Buybacks, please refer to this release notes document.

This is a time-limited bug bounty program valid until November 2, 2021 at 23:59:59 UTC.

Rewards by Threat Level

Rewards 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.

Vulnerabilities mentioned in the audit are considered as out of scope of the bug bounty program.

Payouts are handled by the Fei Labs team directly and are denominated in USD. However, payouts are done in TRIBE or FEI. For Low and Medium threat levels, payouts can alternatively be in ETH or USDC.

Smart Contracts and Blockchain

USD $200,000
USD $50,000

Assets in Scope

If you find a vulnerability in other Fei Protocol assets, please go to their primary bug bounty program - https://immunefi.com/bounty/feiprotocol/.

The smart contracts in this table can be found on the Fei Protocol GitHub at:








For added information, please refer to the following definitions:

  • User Circulating FEI: FEI that is owned by users and not FEI protocol. This represents a liability to the protocol as there needs to be $1 of PCV to redeem this FEI.
  • Protocol Owned FEI: FEI that is owned by the FEI protocol. Not counted in equity or collateralization calculations.
  • Protocol Equity: Protocol equity is calculated by subtracting user circulating FEI from PCV.
  • Collateralization Ratio: the ratio of PCV to user circulating FEI.
  • Resistant Balance: Balance of underlying token, calculated in a manipulation resistant way.

Impacts in Scope

Only the following impacts are accepted within this bug bounty program. All other impacts are not considered as in-scope, even if they affect something in the assets in scope table.

Smart Contracts

  • Loss of user funds staked (principal) by freezing or theft
  • Loss of governance funds
  • Theft of unclaimed yield
  • Freezing of unclaimed yield
  • Temporary freezing of funds for any amount of time
Smart Contract - CollateralizationOracle
Smart Contract - CollateralizationOracleGuardian
Smart Contract - CollateralizationOracleWrapper
Smart Contract - CollateralizationOracleKeeper
Smart Contract - BalancerLBPSwapper
Smart Contract - PCVEquityMinter
Smart Contract - FeiTimedMinter

Prioritized Vulnerabilities

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

Smart Contracts and Blockchain

  • Re-entrancy
  • Logic errors
    • including user authentication errors
  • Solidity/EVM details not considered
    • including integer over-/under-flow
    • including rounding errors
    • 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, pcv controller, etc)

Smart Contracts and Blockchain

  • 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