Hack history / 2023 / Hack or exploit
Exactly
Hack or exploit on Aug 18, 2023 · Improper Access Control
ATTACK TX CONFIRMED ON CHAININ REVIEWSOURCES DISAGREE ON DATE OR LOSS · 5 SOURCES
Lost
$7.5M
sources: $7M to $12M
Returned
none listed
as the sources state it
Rank
#376
among thefts by dollars lost
What happened
Exactly Protocol's DebtManager on Optimism was exploited on August 18, 2023 when unvalidated market address parameter allowed attacker to bypass permit checks and reenter crossDeleverage to steal users' deposited collateral. A copycat repeated the attack the same day.
In review: sources disagree on the loss.
Details
- Date
- Aug 18, 2023
- Kind
- Hack or exploit
- Method
- Improper Access Control
- How in
- Smart contract bug
- Target
- DeFi protocol
- Chains
- Optimism, Ethereum
- Audit (rekt.news)
- out of scope
Related incidents
Safemoon 2023 · Hack or exploit · $8.9M
Terraport 2023 · Hack or exploit · $4M
Curve Finance MEV Bot 2023 · Hack or exploit · $2M
Atlantis Loans 2023 · Hack or exploit · $1.1M
swapX 2023 · Hack or exploit · $1M
Terraport 2023 · Hack or exploit · $4M
Curve Finance MEV Bot 2023 · Hack or exploit · $2M
Atlantis Loans 2023 · Hack or exploit · $1.1M
swapX 2023 · Hack or exploit · $1M
Cite this page
SwanBluechip, "Exactly hack, Aug 18, 2023: $7.5M lost", Crypto hack history, https://swan-hack-tracker.pages.dev/history/i/ht03055e85a4/ (data as of 2026-10-31).