Out-of-Bounds Write Vulnerability in Apple Operating Systems
CVE-2025-43400

6.3MEDIUM

Key Information:

Vendor: Apple
Status: Mac OS; Visionos; iOS And iPad OS
Vendor: CVE Published:; 29 September 2025

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📈 Score: 465📰 News Worthy

What is CVE-2025-43400?

CVE-2025-43400 is a significant vulnerability identified within Apple operating systems, specifically relating to an out-of-bounds write issue. This flaw occurs during the processing of specially crafted fonts, whereby improper bounds checking allows a malicious actor to manipulate memory allocation. Such exploitation could lead to unforeseen termination of applications or potential corruption of process memory, impacting system stability and security. The vulnerability affects various Apple platforms, including macOS and iOS, and emphasizes the critical need for users and organizations to stay updated with the latest security patches to safeguard their devices.

Potential impact of CVE-2025-43400

Application Instability: Exploiting this vulnerability may cause unexpected crashes in applications, leading to interruptions in workflow and potential data loss, which can severely affect user productivity.
Memory Corruption: The out-of-bounds write could compromise the integrity of process memory, potentially enabling further exploitation by malicious actors to escalate privileges or execute arbitrary code.
Wider System Vulnerability: Due to the nature of the flaw affecting core components of Apple’s operating systems, it could serve as a conduit for more extensive security breaches, heightening the risk of attacks against other software and systems on the network.