CVE-2025-43273: 
macOS vulnerability analysis and mitigation

CVE-2025-43273 is a permissions vulnerability discovered in Apple's macOS Sequoia operating system that allows a sandboxed process to circumvent sandbox restrictions. The vulnerability was disclosed on July 29, 2025, and affects versions of macOS Sequoia prior to 15.6. The issue was identified by multiple security researchers including Seo Hyun-gyu (@wh1te4ever), Dora Orak, Minghao Lin (@Y1nKoc), XiLong Zhang (@Resery4) of Xiaomi, noir (@ROIS), and fmyy (@风沐云烟) (Apple Support).

The vulnerability stems from a permissions issue in the CoreMedia component of macOS Sequoia. The security flaw has been assigned a CVSS 3.1 Base Score of 9.1 (CRITICAL) with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N, indicating a high-severity issue with network accessibility, low attack complexity, and no required privileges or user interaction (CIS Advisory).

The vulnerability allows a sandboxed process to bypass sandbox restrictions, potentially compromising the security boundaries established by the macOS sandbox system. This could lead to unauthorized access to protected system resources and sensitive data outside the intended sandbox environment (Apple Support).

Apple has addressed this vulnerability by implementing additional sandbox restrictions in macOS Sequoia 15.6. Users are strongly advised to update their systems to this version or later to protect against potential exploitation (Apple Support).