Apple iOS, macOS, iPadOS Pointer Authentication (PAC) Bypass Vulnerability (CVE-2025-31201) Critical Security Advisory

1. Vulnerability Overview & Root Cause

This vulnerability (CVE-2025-31201) is a critical flaw that allows bypassing Pointer Authentication (PAC), a hardware-assisted security feature designed to detect and prevent unauthorized modification of pointers in memory. The root cause lies in a vulnerable code path within the system components that failed to properly restrict pointer manipulation. An attacker who already possesses arbitrary memory read and write capabilities could exploit this flaw to forge pointer signatures or bypass validation entirely. Apple addressed this issue by completely removing the vulnerable code.

2. Exploitation Mechanics & Attack Scenario

In a typical exploitation chain, an attacker first leverages a separate vulnerability (such as a WebKit memory corruption bug) to gain arbitrary read/write access to the process memory. Under normal circumstances, PAC would prevent the attacker from hijacking control flow or executing arbitrary code in the kernel. However, by exploiting CVE-2025-31201, the attacker can bypass PAC validation, allowing them to execute arbitrary code, escape the sandbox, and escalate privileges to the kernel level. This vulnerability has been reported as actively exploited in highly targeted, sophisticated attacks in the wild.

3. Infrastructure & Business Impact

As a zero-day vulnerability listed in the CISA KEV catalog, this flaw poses an immediate threat to enterprise environments. Compromise of corporate-owned or BYOD Apple devices could lead to the theft of sensitive corporate data, session tokens, and credentials. Furthermore, compromised endpoints can be used as a pivot point to infiltrate internal corporate networks, leading to potential lateral movement and broader infrastructure compromise.