CVE-2025-43337: 
macOS vulnerability analysis and mitigation

CVE-2025-43337 is an improper access control vulnerability in the AppleMobileFileIntegrity component of macOS that allows a malicious application to access sensitive user data by bypassing sandbox restrictions. It was discovered by Csaba Fitzl (@theevilbit) and Nolan Astrein of Kandji, and publicly disclosed on September 15, 2025. The vulnerability affects macOS versions prior to Tahoe 26.0 and was also patched in macOS Sequoia 15.7.2 (released November 3, 2025). It carries a CVSS v3.1 base score of 5.5 (Medium) (Apple Advisory, Apple Sequoia Advisory).

The root cause is classified as CWE-284 (Improper Access Control), specifically an access issue within the AppleMobileFileIntegrity subsystem that failed to enforce adequate sandbox restrictions. Apple addressed the issue by implementing additional sandbox restrictions. The attack vector is local, requires user interaction (e.g., running a malicious app), and does not require elevated privileges — making it accessible to any app a user executes. No public proof-of-concept or detailed technical write-up has been identified at this time (Apple Advisory, Apple Sequoia Advisory).

Successful exploitation allows a malicious application to escape its sandbox and access sensitive user data it would not normally be permitted to read, resulting in a high confidentiality impact with no integrity or availability impact. The vulnerability is scoped to the local system and does not provide a direct path to remote code execution or lateral movement. However, unauthorized access to sensitive user data (e.g., credentials, personal files, or protected application data) could facilitate further attacks or privacy violations (Apple Advisory).

There is no public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of this report. The EPSS score is approximately 0.018% (0.000180), indicating a very low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been reported (Apple Advisory).

Apple has released patches addressing this vulnerability in two updates: macOS Tahoe 26.0 (released September 15, 2025) and macOS Sequoia 15.7.2 (released November 3, 2025). Users should upgrade to one of these versions immediately. As a general precaution, avoid installing applications from untrusted or unverified sources, and consider implementing application whitelisting on managed endpoints (Apple Advisory, Apple Sequoia Advisory).

The vulnerability was part of a broader batch of security fixes in macOS Tahoe 26 and macOS Sequoia 15.7.2, which received coverage from security news aggregators and scanner vendors including Tenable and Qualys. The SANS Internet Storm Center noted the Apple security releases in their diary entries. No significant independent researcher commentary or social media discussion specific to CVE-2025-43337 has been identified beyond standard vulnerability tracking.