CVE-2021-30866 Information disclosure in iOS and iPadOS
Attackers can passively track devices via WiFi MAC address, impacting user privacy on Apple operating systems.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-30866?
CVE-2021-30866 is a medium-severity vulnerability in Apple Ipados, published on 24 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A user privacy issue was addressed by removing the broadcast MAC address. This issue is fixed in tvOS 15, watchOS 8, iOS 15 and iPadOS 15. A device may be passively tracked by its WiFi MAC address.
Which versions are affected by CVE-2021-30866?
It affects 5 products.
Products include Apple Ipados, Apple Iphone Os, Apple Macos, Apple Tvos, Apple Watchos.
How do I fix CVE-2021-30866?
No fix has been published for CVE-2021-30866 yet. Limit exposure of the affected software until one is available.
Is CVE-2021-30866 being exploited?
There is no known exploitation of CVE-2021-30866 in the wild and no public exploit code.
Other vulnerabilities in Apple Ipados
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- CVE-2025-24201 Apple Multiple Products WebKit Out-of-Bounds Write
- CVE-2025-24085 Apple Multiple Products Use-After-Free
- CVE-2025-31200 Apple Multiple Products Memory Corruption
- CVE-2025-31201 Apple Multiple Products Arbitrary Read and Write