CVE-2025-43373 is a security vulnerability identified in Apple macOS that stems from improper memory handling within the kernel. Specifically, a malicious application running on the affected macOS versions can trigger unexpected system termination (crashes) or corrupt kernel memory, which could lead to system instability or potentially facilitate further exploitation. The vulnerability affects macOS versions prior to 14.8.2 (Sonoma) and 15.7.2 (Sequoia), where Apple has implemented improved memory handling to address the issue. Although the exact technical details such as the memory handling flaw type or exploitation method are not disclosed, the impact involves kernel-level memory corruption, which is critical as the kernel operates with the highest privileges. No CVSS score has been assigned yet, and no known exploits have been reported in the wild, indicating either recent discovery or limited exposure so far. The vulnerability requires that an attacker be able to run a malicious app on the target system, which may limit exploitation vectors to scenarios where users install untrusted software or are otherwise compromised. The flaw primarily threatens system availability by causing crashes and integrity by corrupting kernel memory, potentially opening avenues for privilege escalation or denial of service. The patch availability in recent macOS updates underscores the importance of timely updates to mitigate this risk.

For European organizations, this vulnerability poses a significant risk to the stability and security of macOS-based systems. Organizations relying on Apple hardware for critical operations could face unexpected system crashes leading to downtime, loss of productivity, or disruption of services. Kernel memory corruption could also undermine system integrity, potentially allowing attackers to escalate privileges or bypass security controls if combined with other exploits. While no active exploitation is known, the presence of this vulnerability increases the attack surface, especially in environments where users have the ability to install applications. Sectors such as finance, government, technology, and creative industries with high macOS usage are particularly vulnerable. The impact extends to endpoint security, requiring enhanced monitoring for anomalous app behavior and rapid patch deployment. Failure to address this vulnerability could result in operational disruptions and increased risk of targeted attacks leveraging kernel-level flaws.

European organizations should immediately verify the macOS versions deployed across their environment and prioritize upgrading to macOS Sonoma 14.8.2 or Sequoia 15.7.2 or later, where the vulnerability is fixed. Implement strict application whitelisting and restrict the installation of unauthorized software to reduce the risk of malicious apps running on endpoints. Enhance endpoint detection and response (EDR) capabilities to monitor for abnormal system crashes or suspicious kernel-level activity that could indicate exploitation attempts. Conduct user awareness training to prevent installation of untrusted applications and enforce least privilege principles to limit user permissions. Regularly audit and inventory macOS devices to ensure compliance with patching policies. Consider network segmentation to isolate critical macOS systems and reduce lateral movement opportunities. Finally, maintain up-to-date backups to enable rapid recovery in case of system failure caused by exploitation.