CVE-2025-43482 is a vulnerability in Apple macOS that allows a local application to cause a denial-of-service (DoS) condition by exploiting improper input validation. The root cause is classified under CWE-20, indicating that the system fails to properly validate or sanitize input data, which can be manipulated by an attacker to disrupt normal operations. This vulnerability affects multiple macOS versions prior to Sequoia 15.7.3, Sonoma 14.8.3, and Tahoe 26.2, where Apple has implemented improved input validation to mitigate the issue. The attack vector requires local access with low privileges (AV:L, PR:L), meaning an attacker must have some level of access to the system but does not require elevated privileges or user interaction (UI:N). The impact is limited to availability (A:H), causing the system or affected components to crash or become unresponsive, but it does not compromise confidentiality or integrity. The CVSS v3.1 base score is 5.5, reflecting medium severity due to the moderate impact and limited attack vector. No known exploits have been reported in the wild, suggesting the vulnerability is not yet actively weaponized. However, the potential for disruption exists, especially in environments where macOS systems are critical to operations. The vulnerability highlights the importance of robust input validation in preventing denial-of-service attacks and maintaining system stability.

The primary impact of CVE-2025-43482 is a denial-of-service condition on affected macOS systems, which can disrupt availability of services or applications running on those systems. For organizations, this could mean temporary loss of productivity, interruption of critical workflows, or downtime of macOS-dependent infrastructure. Since exploitation requires local access with low privileges, the threat is more relevant in environments where untrusted or semi-trusted users have access to macOS machines, such as shared workstations, development environments, or multi-user systems. The vulnerability does not affect confidentiality or integrity, so data breaches or unauthorized modifications are not a concern here. However, repeated or targeted exploitation could degrade user trust and system reliability. In sectors relying heavily on Apple hardware—such as creative industries, education, and certain enterprise environments—this could translate into operational disruptions. The absence of known exploits in the wild reduces immediate risk but does not eliminate the need for timely patching to prevent future attacks.

To mitigate CVE-2025-43482, organizations should promptly apply the security updates released by Apple in macOS Sequoia 15.7.3, Sonoma 14.8.3, and Tahoe 26.2 or later versions. Beyond patching, organizations should enforce strict access controls to limit local user privileges and reduce the risk of untrusted applications running on macOS systems. Implement application whitelisting or endpoint protection solutions that can detect or block suspicious local applications attempting to exploit input validation flaws. Regularly audit and monitor system logs for unusual application crashes or service disruptions that could indicate exploitation attempts. Educate users about the risks of running unverified software locally and encourage adherence to the principle of least privilege. In environments with shared macOS devices, consider additional segmentation or user session isolation to contain potential DoS impacts. Finally, maintain an up-to-date inventory of macOS devices and their patch status to ensure comprehensive coverage.