Parity Technologies released a new version of the client that fixed a bug that could shut down computers running Ethereum nodes.
The first to discover the vulnerability and report it to Parity was Scott Bigelow, vice president of blockchain development at Amberdata analytic startup. According to him, only a small part of Parity's customers are at risk.
There was a vulnerability that [if exploited] would cause an immediate crash of the Parity client for all its services. There is no possibility to steal funds or do other malicious things but you could shut down some portion of ethereum nodes.
Vice president of blockchain development, Amberdata
Parity Technologies encouraged users to upgrade their clients to the latest version as soon as possible, especially those where the publicly available RPC and transaction history tracking module are activated.
Remote Procedure Call (RPC) is a protocol that allows you to request program data on third-party servers. In the blockchain industry, it is used to obtain information on balances at addresses, block numbers, and other information.
To date, the Parity client uses about 21% of nodes in the Ethereum network (3257, according to EtherNodes).