Hack history / Monthly reports / 2021-06
Crypto hacks and thefts, June 2021
Thefts are hacks, exploits, phishing, scams and rug pulls, in dollars at the time. A single source for $500M or more waits for a second source before it counts.
Taken
$137.4M
21 thefts
vs the month before
−64%
−64% ($385.8M)
vs a year earlier
116×
116× ($1.2M)
Largest thefts
StakeHound / Fireblocks 21 · Key Brute Forced$72MStableMagnet 23 · Backdoor Contract$27MJBS 10 · Ransomware$11MGainSwap 08 · Rug Pull$8MAlchemix V2 16 · Borrow Logic Flaw$6.5MEleven Finance 22 · Withdrawal Logic Flaw$4.5MFetch.ai 06 · Private Key Compromised$2.6MPolyButterfly 05 · Rug Pull$1.5MEvoDefi 10 · Reward Logic Flaw$1MVisor Finance 19 · Improper Access Control$505K
How attackers got in
Keys, accounts and infrastructure 2$74.6M
Insiders: rug pulls, frauds, collapses 3$36.5M
Smart contract bug 11$14.5M
Other 2$11M
Price, oracle and governance 2$500K
Bridge and cross-chain 1$350K
By chain
Ethereum 6$79.9M
BNB Chain 8$33.7M
not stated 2$11M
HECO 1$8M
Multiple 1$2.6M
Polygon 3$2.2M
By target
DeFi protocol 15$114.3M
not stated 5$20.5M
Centralized exchange 1$2.6M
Collapses and frauds, counted apart
1 cases, $1.1M.
Cite this page
SwanBluechip, "Crypto hacks and thefts, June 2021", Crypto hack history, https://swan-hack-tracker.pages.dev/history/m/2021-06/ (data as of 2026-10-31).