This will be another cause on why Ethereum 2.0 might be delayed. Security vulnerabilites. Ethereum developers were never the best in securing their systems by producing secure code. The Dao had investors' millions of dollars
stolen and the Parity bug had millions of dollars frozen.
An audit of the ETH 2.0 specifications highlighted the need to address potential vulnerabilities with the protocol’s peer-to-peer (P2P) networking layer and block proposer system, according to the published findings.
As The Block previously explained, developers would need to implement a major multi-client testnet and run it for at least two months before the Phase 0 mainnet launch can take place. Therefore, it is unlikely that the launch will happen in the upcoming weeks.Read in full https://www.theblockcrypto.com/post/59936/a-new-ethereum-2-0-audit-has-highlighted-potential-security-vulnerabilities