CVE-2021-30780: Apple iPhone OS

High severity, CVSS 7.8. EPSS: 1.3% chance of exploitation in the next 30 days.

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.7, macOS Big Sur 11.5, watchOS 7.6, tvOS 14.7, Security Update 2021-005 Mojave, Security Update 2021-004 Catalina. A malicious application may be able to gain root privileges.

Affected products

• Apple iPhone OS: before 14.7 (fixed in 14.7)
• Apple Mac OS X: from 10.14, up to and including 10.14.5; from 10.15, up to and including 10.15.6; version 10.14.6 only; version 10.15.7 only
• Apple macOS: from 11.0, before 11.5 (fixed in 11.5)
• Apple tvOS: before 14.7 (fixed in 14.7)
• Apple watchOS: before 7.6 (fixed in 7.6)

Published 2021-09-08. Last modified 2026-06-17.