Hack history / 2021 / Hack or exploit
Eleven Finance
Hack or exploit on Jun 22, 2021 · Withdrawal Logic Flaw
ATTACK TX CONFIRMED ON CHAININ REVIEWSOURCES DISAGREE ON DATE OR LOSS · 4 SOURCES
Lost
$4.5M
sources: $300K to $4.5M
Returned
none listed
as the sources state it
Rank
#483
among thefts by dollars lost
What happened
On June 22, 2021, Eleven Finance's NRV vaults were drained for $4.5M via a logic flaw in emergencyBurn(). The attacker used flashloans to obtain assets, converted them to Nerve-bridged tokens, and deposited them into MasterMind. The function failed to burn shares, allowing repeated withdrawals from the same position.
In review: sources disagree on the loss.
Details
- Date
- Jun 22, 2021
- Kind
- Hack or exploit
- Method
- Withdrawal Logic Flaw
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- BNB Chain
- Audit (rekt.news)
- unaudited
After the theft
- Returned by the attacker
- $4.5M
“On September 30th, hackers have returned approximately $4.5 million in stolen funds.” (SlowMist Hacked)
Reported by
Related incidents
Cite this page
SwanBluechip, "Eleven Finance hack, Jun 22, 2021: $4.5M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht9cc9eddc3a/ (data as of 2026-11-01).