CVE-2025-43364 is a race condition vulnerability in Apple macOS sandboxing mechanisms that could allow a malicious or compromised application to break out of its sandbox environment. The sandbox is a critical security feature designed to isolate applications and limit their access to system resources and user data. This vulnerability arises from a timing flaw where the system fails to properly validate certain operations atomically, enabling an attacker to exploit the race condition to escalate privileges or access unauthorized resources. The issue affects macOS versions prior to Sequoia 15.7, Sonoma 14.8, and Tahoe 26.1, where Apple has implemented additional validation to prevent this race condition. The CVSS 3.1 base score of 7.8 reflects high impact on confidentiality, integrity, and availability, with an attack vector requiring local access and user interaction but no privileges. The CWE-362 classification confirms the root cause as a race condition. Although no exploits have been reported in the wild, the vulnerability poses a significant risk due to the potential for sandbox escape, which can lead to broader system compromise. The absence of patch links suggests users should update to the specified macOS versions to remediate the issue. This vulnerability is particularly concerning for environments relying on sandboxing for security isolation, such as enterprise macOS deployments and systems running untrusted or third-party applications.

The primary impact of CVE-2025-43364 is the potential for an application to escape the macOS sandbox, undermining a fundamental security boundary. This can lead to unauthorized access to sensitive data, privilege escalation, and execution of arbitrary code with higher privileges. Confidentiality is at risk because sandbox escape can expose user data and system secrets. Integrity is compromised as attackers may alter system files or configurations. Availability can also be affected if attackers disrupt system processes or services. For organizations, this vulnerability threatens endpoint security, especially in environments where sandboxing is used to contain potentially risky applications or untrusted code. The ease of exploitation is moderate, requiring local access and user interaction, but no prior privileges, increasing the attack surface. The scope includes all affected macOS versions prior to the patched releases, impacting desktops, laptops, and potentially servers running macOS. This can facilitate lateral movement within networks and persistence by adversaries. The lack of known exploits currently reduces immediate risk but does not eliminate the threat, making proactive patching critical.

To mitigate CVE-2025-43364, organizations should immediately update all macOS systems to versions Sequoia 15.7, Sonoma 14.8, or Tahoe 26.1 or later, where the vulnerability is fixed. Beyond patching, implement strict application whitelisting and sandboxing policies to limit the execution of untrusted or unnecessary applications. Employ endpoint detection and response (EDR) tools to monitor for anomalous behaviors indicative of sandbox escape attempts, such as unusual inter-process communications or privilege escalations. Educate users about the risks of running untrusted software and the importance of user interaction in exploitation scenarios. Restrict local access to macOS systems by enforcing strong physical security and limiting user permissions to the minimum necessary. Regularly audit and review installed applications and their sandbox permissions to reduce the attack surface. Consider deploying macOS security features like System Integrity Protection (SIP) and Apple’s notarization requirements to further harden the environment. Finally, maintain an incident response plan tailored to macOS environments to quickly address any exploitation attempts.