Coinis Hack

REPORTED LOSS $1.9M
Medium Access Control

What happened

In September 2017, there was an accident where coins stored in the hot wallet of the Coinis service were withdrawn by external hacking. After recognizing the situation, an emergency convened all employees to additionally prevent withdrawals due to external hacking, and security measures such as changing the system access password were implemented.

The total amount of damage due to this hack is about 2.1 billion won as of the closing price of September 22, about 508 BTC were withdrawn in total.

Case & protocol details

Classification CeFi
Protocol Type Exploit/Access control

Evidence & learning

Attack pattern

Compare incidents →
Access Control Attacks

Sources and on-chain records

Browse all hacks

Other incidents recorded with the same attack technique.

AFX $24.1M
B² Network $3.8M
Third-party SquidRouterModule $3.2M
StablR $12.8M

Build your security review skills

Work through hands-on labs covering real exploit mechanics, review techniques, and defensive patterns.

Start Free Trial Explore attack classes