Hack history / 2025 / Hack or exploit
1inch Swap
Hack or exploit on Mar 5, 2025 · Arbitrary External Call
SOURCES AGREE ON DATE AND LOSS · 5 SOURCES
Lost
$5M
dollars at the time
Returned
none listed
as the sources state it
Rank
#447
among thefts by dollars lost
What happened
On March 5, 2025, 1inch disclosed a $5M exploit in Fusion v1 resolver contracts when a buffer overflow in _settleOrder() allowed an attacker to trigger integer underflow and hijack control flow to impersonate resolvers and execute unauthorized swaps. Most funds were recovered after negotiation.
Details
- Date
- Mar 5, 2025
- Kind
- Hack or exploit
- Method
- Arbitrary External Call
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum
After the theft
- Recovered or seized
- yes, amount not stated
“Most funds were recovered after negotiation.” (DefiLlama)
Related incidents
CoW Swap 2026 · Hack or exploit · $1.2M
Trader loses almost $50 million in Aave swap gone wrong 2026 · Costly mistake or other · $50M
1inch Swap 2024 · Hack or exploit · $723K
1inch 2024 · Hack or exploit · undisclosed
WOOFi Swap 2024 · Hack or exploit · $8.8M
Trader loses almost $50 million in Aave swap gone wrong 2026 · Costly mistake or other · $50M
1inch Swap 2024 · Hack or exploit · $723K
1inch 2024 · Hack or exploit · undisclosed
WOOFi Swap 2024 · Hack or exploit · $8.8M
Cite this page
SwanBluechip, "1inch Swap hack, Mar 5, 2025: $5M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht6323b9aadf/ (data as of 2026-10-31).