Hack history / 2014 / Hack or exploit
Flexcoin
Hack or exploit on Mar 2, 2014 · Withdrawal Logic Flaw
ONE SOURCE · 1 SOURCE
Lost
$600K
dollars at the time
Returned
none listed
as the sources state it
Rank
#1,093
among thefts by dollars lost
What happened
Flexcoin's exchange had a race condition in its transfer code. An attacker sent thousands of simultaneous transfer requests between user accounts, moving coins from one account to another until the sending account was overdrawn before balances were updated, stealing 896 BTC.
Details
- Date
- Mar 2, 2014
- Kind
- Hack or exploit
- Method
- Withdrawal Logic Flaw
- How in
- Smart contract bug
- Target
- Centralized exchange
- Chains
- Bitcoin
Reported by
Related incidents
Cite this page
SwanBluechip, "Flexcoin hack, Mar 2, 2014: $600K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht8b9a9b622b/ (data as of 2026-10-31).