CVE-2025-43300: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

Critical severity, CVSS 10.0. Actively exploited: in CISA KEV since 2025-08-21. EPSS: 32.5% 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 15.8.5 and iPadOS 15.8.5, iOS 16.7.12 and iPadOS 16.7.12, iOS 18.6.2 and iPadOS 18.6.2, iPadOS 17.7.10, macOS Sequoia 15.6.1, macOS Sonoma 14.7.8, macOS Ventura 13.7.8. Processing a malicious image file may result in memory corruption. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals.

Affected products

• Apple iPadOS: before 15.8.5 (fixed in 15.8.5); from 16.0, before 16.7.12 (fixed in 16.7.12); from 17.0, before 17.7.10 (fixed in 17.7.10); from 18.0, before 18.6.2 (fixed in 18.6.2)
• Apple iPhone OS: before 15.8.5 (fixed in 15.8.5); from 16.0, before 16.7.12 (fixed in 16.7.12); from 17.0, before 18.6.2 (fixed in 18.6.2)
• Apple macOS: from 13.0, before 13.7.8 (fixed in 13.7.8); from 14.0, before 14.7.8 (fixed in 14.7.8); from 15.0, before 15.6.1 (fixed in 15.6.1)

Published 2025-08-21. Last modified 2026-06-17.