Hack history / 2021 / Hack or exploit
THORChain DEX
Hack or exploit on Jul 15, 2021 · Bridge Logic Flaw
IN REVIEWSOURCES DISAGREE ON DATE OR LOSS · 3 SOURCES
Lost
$5M
sources: $5M to $7.6M
Returned
none listed
as the sources state it
Rank
#453
among thefts by dollars lost
What happened
On July 16, 2021, an attacker exploited an override function in THORChain's Bifrost bridge, wrapping the router contract to repeatedly extract value from liquidity pools by manipulating reported deposit amounts, draining approximately $4.9-7.4 million.
In review: possible duplicate within one source; sources disagree on the loss.
Details
- Date
- Jul 15, 2021
- Kind
- Hack or exploit
- Method
- Bridge Logic Flaw
- How in
- Bridge and cross-chain
- Target
- DeFi protocol
- Chains
- Ethereum
- Audit (rekt.news)
- unaudited
Reported by
Related incidents
THORChain DEX 2026 · Hack or exploit · $10.7M
Thorchain founder exploited for $1.35 million 2025 · Hack or exploit · $1.4M
THORChain 2022 · Hack or exploit · undisclosed
THORChain 2021 · Phishing · $76K
THORChain DEX 2021 · Hack or exploit · $8M
Thorchain founder exploited for $1.35 million 2025 · Hack or exploit · $1.4M
THORChain 2022 · Hack or exploit · undisclosed
THORChain 2021 · Phishing · $76K
THORChain DEX 2021 · Hack or exploit · $8M
Cite this page
SwanBluechip, "THORChain DEX hack, Jul 15, 2021: $5M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht0111111548/ (data as of 2026-11-01).