Cross peering connectivity refers to the ability of two different Virtual Private Clouds (VPCs) to communicate with each other using their respective IP addresses. By default, cross peering connectivity is not allowed between VPCs, and it has to be explicitly enabled by configuring VPC peering. However, in some cases, EC2 instances may be misconfigured to allow cross peering connectivity, which can pose a security risk. This can happen if an EC2 instance is configured to allow traffic from IP addresses outside its VPC, or if it is part of a security group that allows traffic from a peered VPC.
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