A privacy issue existed in motion sensor calibration. This issue was addressed with improved motion sensor processing. This issue is fixed in iOS 12.2, watchOS 5.2. A malicious app may be able to track users between installs.
Severity
CVSS 3.1
3.3 low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS
0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-31)