A user privacy issue was addressed by removing the broadcast MAC address. This issue is fixed in iOS 12.2. A device may be passively tracked by its WiFi MAC address.
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APPLE-SA-2019-3-25-1 iOS 122
iOS 122 is now available and addresses the following:
CFString
Available for: iPhone 5s and later, iPad Air and later, and iPod
touch 6th generation
Impact: Processing a maliciously crafted string may lead to a denial
of service
Description: A validation issue was add ...