CVE-2025-43520
Published 2025-12-12 · Updated 2026-10-07 · Source product-security@apple.com
Summary
CVE-2025-43520 is a medium-severity (CVSS 5.5) vulnerability in Apple Multiple Products. CISA added it to the Known Exploited Vulnerabilities catalog on March 20, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 3, 2026. CISA does not currently list it as used in ransomware campaigns. Apple has 96 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.
All 96 known-exploited Apple vulnerabilities →Description
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.
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CISA Known-Exploited Vulnerability
Product: Apple — Multiple Products
Name: Apple Multiple Products Classic Buffer Overflow Vulnerability
Date added: 2026-03-20 · Due: 2026-04-03
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
References
- https://support.apple.com/en-us/125632
- https://support.apple.com/en-us/125633
- https://support.apple.com/en-us/125634
- https://support.apple.com/en-us/125635
- https://support.apple.com/en-us/125636
- https://support.apple.com/en-us/125637
- https://support.apple.com/en-us/125638
- https://support.apple.com/en-us/125639