Hack history / Monthly reports / 2021-12
Crypto hacks and thefts, December 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
$614.5M
37 thefts
vs the month before
+199%
+199% ($205.3M)
vs a year earlier
−83%
−83% ($3.56B)
Largest thefts
Bitmart 04 · Hot Wallet Key Compromised$196MVulcan Forged 13 · Hot Wallet Key Compromised$135MBadger DAO 02 · CDN Compromise$120MAscenDEX 11 · Hot Wallet Key Compromised$77MGrim Finance 18 · Reentrancy$30MMASK Token 28 · Scam$10MGamma 21 · Reentrancy$8.2MVisor Finance 21 · Contract Vulnerability$8.2MPizza DeFi 05 · Arithmetic Error$5MGamma 21 · Arithmetic Error$4.5M
How attackers got in
Keys, accounts and infrastructure 5$528.6M
Smart contract bug 12$59.9M
Phishing and scams 5$15.5M
Insiders: rug pulls, frauds, collapses 5$6.8M
Other 7$2.3M
Price, oracle and governance 3$1.4M
By chain
Ethereum 23$572.4M
BNB Chain 4$274.1M
Polygon 5$214.7M
Fantom 1$30M
EOS 2$5.5M
Harmony 1$1.8M
Solana 1$1.3M
not stated 5$940K
By target
DeFi protocol 11$309M
Centralized exchange 3$273M
not stated 21$31.2M
NFTfi 1$1.3M
Wallet 1$0
Collapses and frauds, counted apart
3 cases, $260K.
Cite this page
SwanBluechip, "Crypto hacks and thefts, December 2021", Crypto hack history, https://swan-hack-tracker.pages.dev/history/m/2021-12/ (data as of 2026-10-31).