An input validation issue was addressed with improved input validation. This issue is fixed in iOS 12.3, watchOS 5.2.1. Processing a maliciously crafted message may lead to a denial of service.
Severity
CVSS 3.1
6.5 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS
0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)