Hack history / 2021 / Hack or exploit
Mirror
Hack or exploit on Oct 8, 2021 · Improper Access Control
SOURCES AGREE ON DATE AND LOSS · 2 SOURCES
Lost
$90M
dollars at the time
Returned
none listed
as the sources state it
Rank
#69
among thefts by dollars lost
What happened
Mirror Protocol was exploited from October 8, 2021 through May 17, 2022 (discovered) via duplicate ID vulnerability in collateral unlock logic, allowing excessive unlocks without proportional validation. Over seven months, attackers siphoned $89.7M before detection due to limited Terra monitoring.
Details
- Date
- Oct 8, 2021
- Kind
- Hack or exploit
- Method
- Improper Access Control
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Terra
- Audit (rekt.news)
- unaudited
Reported by
Related incidents
Mirror 2023 · Hack or exploit · undisclosed
Mirror Protocol 2022 · Hack or exploit · $2M
Mirror 2022 · Hack or exploit · $88M
Poly Network 2021 · Hack or exploit · $611M
ValueDefi 2021 · Hack or exploit · $10M
Mirror Protocol 2022 · Hack or exploit · $2M
Mirror 2022 · Hack or exploit · $88M
Poly Network 2021 · Hack or exploit · $611M
ValueDefi 2021 · Hack or exploit · $10M
Cite this page
SwanBluechip, "Mirror hack, Oct 8, 2021: $90M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht8e8aa547ef/ (data as of 2026-10-31).