When you use peering in AKS, with the "default" AKS deployment, your complete cluster, including all pods, is completely open and addressable from your complete peered network.
Learn how to fix in this article.
More: https://blog.coffeeapplied.com/securing-aks-in-peered-virtual-networks-using-only-network-security-groups-nsgs-c43d6a215f32
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