Hack history / 2021 / Hack or exploit
ChainSwap
Hack or exploit on Nov 7, 2021 · Caller Impersonation
ONE SOURCE · 1 SOURCE
Lost
$4.4M
dollars at the time
Returned
none listed
as the sources state it
Rank
#497
among thefts by dollars lost
What happened
ChainSwap bridge suffered an access control vulnerability in its cross-chain quota code. The attacker exploited a logical flaw that allowed invalid, non-whitelisted addresses to bypass authorization, take control of target projects' BSC contracts, and mint tokens directly to the attacker's address for sale.
Details
- Date
- Nov 7, 2021
- Kind
- Hack or exploit
- Method
- Caller Impersonation
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum, BNB Chain
Reported by
Related incidents
Cite this page
SwanBluechip, "ChainSwap hack, Nov 7, 2021: $4.4M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht6d2e658c9c/ (data as of 2026-10-31).