Blockchain technology is considered to be secure and immutable due to its decentralized nature. But as it becomes more popular with new solutions popping up almost daily, hackers become inventive enough to find vulnerabilities and attack it.
Presently, these attacks mostly target cryptocurrency blockchains and are aimed at stealing funds. However, as the number of use cases for the technology grows, hackers are very likely to find other purposes and vulnerabilities for their criminal actions.
Info link:
https://coinidol.com/blockchain-cyberattacks-growing/