Hidden Wi-Fi weak security message
Wi-Fi network message “hidden network weak security”
iPad Pro, iPadOS 15
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See the information in Recommended settings for Wi-Fi routers and access points - Apple Support including the following:
If your Apple device shows a privacy warning or weak-security warning about a Wi-Fi network, that network could expose information about your device. Apple recommends connecting to Wi-Fi networks that meet or exceed the security standards in this article.