What is CVE-2021-30866?

CVE-2021-30866 is a medium-severity vulnerability in Apple iOS And Ipados. CVSS score: 6.5/10. Published 2021-08-24.

How severe is CVE-2021-30866?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2021-30866

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.

Published 2021-08-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (42.4th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Apple iOS And Ipados — versions unspecified
Apple Ipados
Apple Iphone OS
Apple macOS
Apple tvOS — versions unspecified
Apple watchOS — versions unspecified

References

Frequently asked questions

What is CVE-2021-30866?: CVE-2021-30866 is a medium-severity vulnerability in Apple iOS And Ipados. CVSS score: 6.5/10. Published 2021-08-24.
How severe is CVE-2021-30866?: Medium severity. CVSS v3 base score is 6.5 out of 10.