Two significant issues were identified and subsequently addressed with the release of Bitcoin Core v22.0 on September 14th, 2021.

The first problem involved an exploit where OP Nodes could be overwhelmed with addr messages. This vulnerability had the potential to crash the nodes, posing a risk to the network's stability. The timely release of a fix in the latest version of Bitcoin Core has mitigated this threat, ensuring that nodes remain resilient against such attacks.

Similarly, a critical vulnerability was discovered concerning how nodes could be crashed by a malicious UPnP device within the local network. This issue not only highlighted the importance of securing local network environments but also prompted immediate action from the developers. Like the previous vulnerability, a fix was included in the Bitcoin Core v22.0 update.

These incidents underscore the ongoing need for vigilance and prompt responsiveness in the cryptocurrency space. By addressing these vulnerabilities swiftly, Bitcoin continues to demonstrate its commitment to security and reliability.