Bug bounty (Immunefi)

Summary: We recognise that gifted coders may find vulnerabilities in our code that we could not - even though our products have yet to be compromised.

Note: We orginized Bug bounty with Immunefi (https://immunefi.com/bounty/multichain/), however, if some vulnerabilities you found is out of scope according to rules of Immunefi, you can report it through mail security@multichain.org directly.

Multichain Bug Bounties up to $2M

This bug bounty program is focused on Multichain's smart contracts, website and app and is focused on preventing:

  • Any governance voting result manipulation

  • Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yield

  • Permanent freezing of funds

  • Miner-extractable value (MEV)

  • Insolvency

Rewards by threat level

Rewards are distributed according to the impact of the vulnerability based on the Immunefi Vulnerability Severity Classification System V2. This is a simplified 5-level scale, with separate scales for websites/apps, smart contracts, and blockchains/DLTs, focusing on the impact of the vulnerability reported.

Smart Contracts




Up to USD 2 000 000


USD 100 000


USD 10 000


USD 1 000

Websites and Applications




USD 200 000


USD 50 000


USD 5 000


USD 1 000

All web/app bug reports must come with a PoC with an end-effect impacting an asset-in-scope in order to be considered for a reward. All Critical Smart Contract bug reports require a PoC and a suggestion for a fix to be eligible for a reward. Explanations and statements are not accepted as PoC and code is required.

Critical smart contract vulnerabilities are capped at 10% of economic damage, primarily taking into consideration funds at risk, but also PR and branding aspects, at the discretion of the team. However, there is a minimum reward of USD 100 000.

All vulnerabilities marked in the security reviews are not eligible for a reward.

Payouts are handled by the Multichain teamdirectly and are denominated in USD. However, payouts are done in USDC.

Assets in Scope

All smart contracts of Multichain can be found at https://github.com/anyswap. However, only those in the Assets in Scope table are considered as in-scope of the bug bounty program.

If an impact can be caused to any other asset managed by Multichain that isn't on this table but for which the impact is in the Impacts in Scope section, you are encouraged to submit it for the consideration of the project. This applies to only Critical and High impacts.

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 the scope table.

Smart Contracts


  • Any governance voting result manipulation

  • Direct theft of any user funds, whether at-rest or in-motion, other than unclaimed yield

  • Permanent freezing of funds

  • Miner-extractable value (MEV)

  • Insolvency


  • Theft of unclaimed yield

  • Permanent freezing of unclaimed yield

  • Temporary freezing of funds for a minimum period of 2 days


  • Smart contract unable to operate due to lack of funds

  • Block stuffing for profit

  • Griefing (e.g. no profit motive for an attacker, but damage to the users or the protocol)

  • Theft of gas

  • Unbounded gas consumption


  • Smart contract fails to deliver promised returns, but doesn't lose value

Websites and Applications


  • Ability to execute system commands

  • Extract Sensitive data/files from the server such as /etc/passwd

  • Stealing User Cookies

  • Taking Down the application/website

  • Bypassing Authentication

  • Signing transactions for other users

  • Redirection of user deposits and withdrawals

  • Subdomain takeover resulting in financial loss (applicable for subdomains with addresses published)

  • Wallet interaction modification resulting in financial loss

  • Direct theft of user funds

  • Tampering with transactions submitted to the user's wallet

  • Submitting malicious transactions to an already-connected wallet


  • Spoofing content on the target application (Persistent)

  • Users Confidential information disclosure such as Email

  • Subdomain Takeover without financial loss (applicable for subdomains with no addresses published)

  • Privilege escalation to access unauthorized functionalities


  • Changing details of other users without direct financial impact (CSRF)

  • Third-Party API keys leakage that demonstrates loss of funds or modification on the website.

  • Redirecting users to malicious websites (Open Redirect)


  • Framing sensitive pages leading to financial loss (ClickJacking)

  • Any impact involving a publicly released CVE without a working PoC

  • Broken Link Hijacking

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)

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

  • Centralization risks

Websites and Apps

  • Theoretical vulnerabilities without any proof or demonstration

  • Content spoofing / Text injection issues

  • Self-XSS

  • Captcha bypass using OCR

  • CSRF with no security impact (logout CSRF, change language, etc.)

  • Missing HTTP Security Headers (such as X-FRAME-OPTIONS) or cookie security flags (such as "httponly")

  • Server-side information disclosure such as IPs, server names, and most stack traces

  • Vulnerabilities used to enumerate or confirm the existence of users or tenants

  • Vulnerabilities requiring unlikely user actions

  • URL Redirects (unless combined with another vulnerability to produce a more severe vulnerability)

  • Lack of SSL/TLS best practices

  • DDoS vulnerabilities

  • Attacks requiring privileged access from within the organization

  • Feature requests

  • Best practices

  • Vulnerabilities primarily caused by browser/plugin defects

  • Any vulnerability exploit requiring CSP bypass resulting from a browser bug

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

About Immunefi

Immunefi is a leading security services provider in Web3, it facilitates a platform that connects Web3 projects in need of watchdogs for their platform and white hat hackers, who get to monetize their expertise by finding potential bugs in the associated projects.

Immunefi can manage bug bounty programs for their clients so that they are able to find and fix bugs in an ethical, efficient, and safe environment that respects client discretion. The platform is used by leading Web3 projects like Synthetix, Compound, SushiSwap, and Chainlink.

All award decisions, including eligibility and payment amount, are at Multichain sole discretion. Multichain reserves the right to refuse to submit and change the terms and conditions of the Program.

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