This week the cryptocurrency community has been discussing and dealing with the critical vulnerability that was found in the Bitcoin Core (BTC) reference client. Many observers are calling the bug one of the worst issues BTC has had in years, comparing the exploit to the March 2013 mandatory hard fork. In fact, in the eyes of many, the network is still vulnerable to massive inflation from an attack that costs a mere 12.5 BTC ($83,000).

Source:
https://news.bitcoin.com/crypto-comm...orced-upgrade/