CVE-2025-43238: 
macOS vulnerability analysis and mitigation

CVE-2025-43238 is an integer overflow vulnerability in the Xsan component of Apple macOS that allows a local app to cause unexpected system termination. It affects macOS Ventura versions before 13.7.7, macOS Sonoma versions before 14.7.7, and macOS Sequoia versions before 15.6. The vulnerability was disclosed by Apple on July 29, 2025, and was reported by an anonymous researcher. It carries a CVSS v3.1 base score of 6.2 (Medium) (Apple Sequoia Advisory, Apple Sonoma Advisory, Apple Ventura Advisory, GitHub Advisory).

The vulnerability is classified as CWE-190 (Integer Overflow or Wraparound), occurring within the Xsan component of macOS. An integer value is incremented or calculated beyond the bounds of its storage type, causing it to wrap around to an unexpected value, which can trigger an unhandled condition leading to system termination. The attack vector is local, requires no privileges, and no user interaction, meaning a locally installed app can trigger the condition without any special entitlements. Apple addressed the issue with improved input validation (Apple Sequoia Advisory, GitHub Advisory).

Successful exploitation results in an unexpected system termination (denial of service), impacting availability with no effect on confidentiality or integrity. The vulnerability is limited in scope to the local system and does not enable code execution, data exfiltration, or privilege escalation based on current information. The primary risk is a crash or forced reboot of the affected macOS system, which could disrupt operations on enterprise or shared Xsan storage environments (Apple Sonoma Advisory, Apple Ventura Advisory).

Apple has released patches addressing this vulnerability in macOS Sequoia 15.6, macOS Sonoma 14.7.7, and macOS Ventura 13.7.7, all released on July 29, 2025. Users and administrators should update affected macOS systems to these versions or later via System Settings > Software Update. No configuration-based workarounds have been published by Apple; upgrading to a patched version is the only recommended remediation (Apple Sequoia Advisory, Apple Sonoma Advisory, Apple Ventura Advisory).