CVE-2025-24284: macOS Sandbox Escape Vulnerability – Sequoia 15.4 Patch Required

Technical summary

This vulnerability stems from insufficient authorization validation in macOS's sandbox enforcement mechanism (CWE-693: Improper Resource Validation). The sandbox is a core macOS security feature that isolates applications and restricts their access to system resources, user data, and kernel privileges. By bypassing these checks, a local attacker or malicious application can escape the sandbox and operate with elevated permissions. The fix implements stricter validation logic to prevent unauthorized actions that previously succeeded under sandbox constraints.

Business impact

Sandbox escape vulnerabilities fundamentally undermine application isolation—a critical layer of macOS security. If exploited, an attacker could steal sensitive user data, install persistent malware, modify system settings, or launch supply-chain attacks through compromised applications. Organizations relying on macOS for development, finance, or sensitive data handling face elevated risk of data exfiltration and system compromise. The high CVSS score (8.8) reflects the severity of this privilege escalation path.

Affected systems

macOS systems running versions prior to Sequoia 15.4 are affected. This includes Sequoia versions before 15.4 and any earlier macOS major releases still in use. Organizations with mixed macOS deployments should audit their OS inventory to identify systems below the patched threshold.

Exploitability

This vulnerability requires local access (AV:L) and low privilege (PR:L), meaning the attacker needs a user account on the target macOS system or a foothold through a local application. No user interaction is required (UI:N), and the attack can be executed automatically once access is established. While not remotely exploitable directly, it poses significant risk in multi-user environments, shared systems, or where malicious software is already present. The low complexity (AC:L) indicates a straightforward exploitation path once local presence is established.

Remediation

Apply macOS Sequoia 15.4 or later on all affected macOS systems. Organizations should verify their macOS version via System Settings > General > About and deploy patches across their macOS fleet. For systems unable to upgrade immediately, network segmentation and application whitelisting can reduce the risk of malicious applications establishing local access. Monitor for suspicious application behavior that attempts to access restricted resources outside normal application scope.

Patch guidance

macOS Sequoia 15.4 and later versions contain the fix. Administrators should prioritize patching given the high severity score and the sandbox escape nature of the vulnerability. Test patches in non-production environments first to ensure compatibility with critical applications, then deploy broadly. Check Apple's security updates page for the complete list of patches included in Sequoia 15.4 and any subsequent releases.

Detection guidance

Monitor for suspicious system calls from applications attempting to access resources outside their declared entitlements. macOS logs in /var/log/system.log and Activity Monitor can reveal unusual process behavior. Security tools using system call tracing or kernel-level monitoring may detect sandbox escape attempts. Behavioral detection focusing on unauthorized file system, network, or process access originating from single applications is valuable. Enable macOS audit logs and review them for sandbox-related violations or entitlement mismatches.

Why prioritize this

This vulnerability merits immediate patching priority. Sandbox escapes are a critical threat because they dismantle a foundational security boundary in macOS. The CVSS score of 8.8 (HIGH) combined with low complexity and low privilege requirements makes this a practical attack vector. Any compromised third-party application or local malware could exploit this to gain system-level access. The fix is stable (released in Sequoia 15.4), and patching is straightforward, reducing implementation friction.

Risk score, explained

CVSS 3.1 score of 8.8 reflects: Local attack vector (AV:L) limits direct remote exploitation but increases risk in shared or BYOD environments; low privilege requirement (PR:L) means a user account suffices; no user interaction required (UI:N) enables automated exploitation; high impact across confidentiality, integrity, and availability (C:H/I:H/A:H) due to sandbox escape allowing full system compromise; and scope change (S:C) indicating the vulnerability affects resources beyond the vulnerable component itself. This combination yields a HIGH severity rating.

Frequently asked questions