CVE-2025-43191 is a vulnerability identified in Apple macOS that stems from improper path handling, specifically an insufficient validation of pathname inputs. This vulnerability is classified under CWE-22, which involves improper limitation of a pathname to a restricted directory, potentially allowing an application to manipulate file system paths in a way that causes unintended behavior. In this case, a malicious or flawed app running locally on the system can exploit this weakness to trigger a denial-of-service (DoS) condition, likely by causing system processes to crash or become unresponsive. The vulnerability affects multiple macOS versions prior to the patched releases: macOS Sequoia 15.6, macOS Sonoma 14.7.7, and macOS Ventura 13.7.7. The fix involves improved validation of path inputs to prevent exploitation. The CVSS v3.1 base score is 6.2, indicating a medium severity level, with an attack vector limited to local access (AV:L), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), and impact limited to availability (A:H) without affecting confidentiality or integrity. No known exploits have been reported in the wild as of the publication date. This vulnerability primarily threatens system availability by enabling an app to cause crashes or system instability through crafted path inputs. The issue is significant for environments where macOS devices are used extensively, especially in enterprise or critical infrastructure contexts.

The primary impact of CVE-2025-43191 is on system availability, as exploitation can cause denial-of-service conditions leading to system crashes or unresponsiveness. This can disrupt business operations, particularly in environments relying heavily on macOS devices for critical tasks. Although the vulnerability does not affect confidentiality or integrity, repeated or targeted exploitation could degrade user productivity and potentially cause data loss if system crashes interrupt active processes. Organizations with large macOS deployments, such as creative industries, software development firms, and enterprises using Apple hardware, may experience operational disruptions. Additionally, critical infrastructure sectors that utilize macOS systems for management or control could face increased risk of downtime. The local attack vector and lack of required privileges limit the threat to scenarios where an attacker or malicious app already has local access, reducing the risk of remote exploitation but emphasizing the importance of controlling application installation and execution privileges.

To mitigate CVE-2025-43191, organizations should promptly apply the security updates released by Apple for macOS Sequoia 15.6, Sonoma 14.7.7, and Ventura 13.7.7 or later. Beyond patching, organizations should enforce strict application control policies to prevent unauthorized or untrusted apps from executing, reducing the risk of local exploitation. Employ endpoint protection solutions capable of detecting anomalous app behavior related to file system access. Regularly audit installed applications and remove unnecessary or suspicious software. Implement least privilege principles to limit user and app permissions, minimizing the potential impact of local attacks. Additionally, monitor system logs for unusual crashes or errors related to file path handling that could indicate attempted exploitation. Educate users about the risks of installing untrusted software and maintain robust backup procedures to recover from potential system disruptions.