CVE-2025-43520 in macOS
Summary
by MITRE • 12/12/2025
A memory corruption issue was addressed with improved memory handling. This issue is fixed in watchOS 26.1, iOS 18.7.2 and iPadOS 18.7.2, macOS Tahoe 26.1, visionOS 26.1, tvOS 26.1, macOS Sonoma 14.8.2, macOS Sequoia 15.7.2, iOS 26.1 and iPadOS 26.1. A malicious application may be able to cause unexpected system termination or write kernel memory.
If you want to get the best quality for vulnerability data then you always have to consider VulDB.
Analysis
by VulDB Data Team • 03/26/2026
This memory corruption vulnerability represents a critical security flaw that affects multiple Apple operating systems including watchOS, iOS, iPadOS, macOS, visionOS, and tvOS. The issue stems from inadequate memory handling mechanisms that could be exploited by malicious applications to trigger unexpected system behavior. The vulnerability has been addressed through improved memory management protocols in the patched versions, which are particularly significant given the widespread use of these operating systems across Apple's ecosystem. The fix demonstrates Apple's ongoing efforts to strengthen kernel-level security controls and prevent potential exploitation pathways that could lead to system compromise.
The technical nature of this flaw falls under memory corruption categories that can enable privilege escalation and arbitrary code execution. When a malicious application successfully exploits this vulnerability, it can cause unexpected system termination or potentially write to kernel memory regions, which represents a severe security risk. This type of vulnerability typically arises from insufficient bounds checking, improper memory deallocation, or race conditions in memory management routines. The impact extends beyond simple application crashes to potentially allowing attackers to gain deeper system access and execute malicious code with elevated privileges. According to CWE classification, this vulnerability would likely map to CWE-122 (Heap Overflow) or similar memory corruption categories that affect system stability and security boundaries.
The operational impact of this vulnerability is substantial across Apple's device portfolio, affecting everything from consumer smartphones and tablets to professional workstations and specialized devices like Apple Vision Pro. Attackers could potentially exploit this flaw to create persistent backdoors, escalate privileges, or cause denial of service conditions that would compromise the integrity of the entire operating system. The fact that multiple platforms are affected indicates a systemic issue in Apple's memory management frameworks that required coordinated patching across the entire ecosystem. Organizations and individual users must prioritize updating their devices to the patched versions, as the window of exposure for this vulnerability could be significant given the broad attack surface.
Mitigation strategies should focus on immediate deployment of the patched operating system versions across all affected devices. System administrators should implement comprehensive inventory tracking to identify all vulnerable endpoints and ensure timely patching. The vulnerability highlights the importance of maintaining current security patches and following Apple's security advisories closely. Organizations should also consider implementing additional monitoring for unusual system behavior or unexpected terminations that could indicate exploitation attempts. Network security teams should be aware of potential indicators of compromise related to memory corruption attacks and prepare incident response procedures. The fix addresses fundamental memory handling issues that align with industry best practices for preventing heap-based buffer overflows and similar memory corruption vulnerabilities. This case study reinforces the critical need for continuous security auditing of system components and the importance of robust memory management in preventing privilege escalation attacks.