Hack history / 2021 / Hack or exploit
Visor Finance
Hack or exploit on Jun 19, 2021 · Improper Access Control
SOURCES AGREE ON DATE AND LOSS · 2 SOURCES
Lost
$505K
dollars at the time
Returned
none listed
as the sources state it
Rank
#1,138
among thefts by dollars lost
What happened
An attacker compromised a single admin account managing Hypervisor emergency withdraw functions, enabling extraction of 504,845 USD from unpositioned assets awaiting LP placement. The team had not yet migrated to a multisig setup and the attacker lacked full visibility into safeguards, limiting losses. The team restored all withdrawn amounts using treasury funds.
Details
- Date
- Jun 19, 2021
- Kind
- Hack or exploit
- Method
- Improper Access Control
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Ethereum
Reported by
Related incidents
Visor Finance 2021 · Hack or exploit · $8.2M
Visor Finance 2021 · Hack or exploit · $976K
Poly Network 2021 · Hack or exploit · $611M
Mirror 2021 · Hack or exploit · $90M
ValueDefi 2021 · Hack or exploit · $10M
Visor Finance 2021 · Hack or exploit · $976K
Poly Network 2021 · Hack or exploit · $611M
Mirror 2021 · Hack or exploit · $90M
ValueDefi 2021 · Hack or exploit · $10M
Cite this page
SwanBluechip, "Visor Finance hack, Jun 19, 2021: $505K lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/htde9b1c0959/ (data as of 2026-11-01).