Bitcoin wallets created between 2011 and 2015 are susceptible to a new kind of exploit called Randstorm that makes it possible to recover passwords and gain unauthorized access to a multitude of wallets spanning several blockchain platforms. “Randstorm() is a term we coined to describe a collection of bugs, design decisions, and API changes that, when brought in contact with each other, combine to dramatically reduce the quality of random numbers produced by web browsers of a certain era (2011-2015),”

Source: The Hacker News