CVE-2025-43520: Apple Multiple Products Classic Buffer Overflow Vulnerability

Medium severity, CVSS 5.5. Actively exploited: in CISA KEV since 2026-03-20. EPSS: 0.4% chance of exploitation in the next 30 days.

A memory corruption issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Sequoia 15.7.2, macOS Sonoma 14.8.2, macOS Tahoe 26.1, tvOS 26.1, visionOS 26.1, watchOS 26.1. A malicious application may be able to cause unexpected system termination or write kernel memory.

Affected products

• Apple iPadOS: before 18.7.2 (fixed in 18.7.2); version 26.0 only
• Apple iPhone OS: before 18.7.2 (fixed in 18.7.2); version 26.0 only
• Apple macOS: from 14.0, before 14.8.2 (fixed in 14.8.2); from 15.0, before 15.7.2 (fixed in 15.7.2); version 26.0 only
• Apple tvOS: before 26.1 (fixed in 26.1)
• Apple visionOS: before 26.1 (fixed in 26.1)
• Apple watchOS: before 26.1 (fixed in 26.1)

Published 2025-12-12. Last modified 2026-10-07.