Hack history / 2021 / Hack or exploit
BearnFi
Hack or exploit on May 17, 2021 · Withdrawal Logic Flaw
SOURCES AGREE ON DATE AND LOSS · 2 SOURCES
Lost
$18M
dollars at the time
Returned
none listed
as the sources state it
Rank
#221
among thefts by dollars lost
What happened
BearnFi's BvaultsBank contract interpreted deposit amounts inconsistently between BUSD and ibBUSD. Attackers exploited this via flashloan cycles to inflate withdrawal amounts.
Details
- Date
- May 17, 2021
- Kind
- Hack or exploit
- Method
- Withdrawal Logic Flaw
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- BNB Chain
- Audit (rekt.news)
- unaudited
Reported by
Related incidents
Cite this page
SwanBluechip, "BearnFi hack, May 17, 2021: $18M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/hte9588df83a/ (data as of 2026-10-31).