CVE-2024-40840 is a vulnerability in Apple’s iOS and iPadOS operating systems that allows an attacker with physical access to a device to leverage Siri to access sensitive user data without authentication or user interaction. The root cause is improper state management within Siri’s processing of voice commands or requests, which can be manipulated to bypass normal security controls. This flaw enables an attacker to extract confidential information from the device, potentially including personal data, messages, or other sensitive content accessible via Siri. The vulnerability affects all versions prior to iOS 18 and iPadOS 18, where Apple has implemented improved state management to close this security gap. The CVSS v3.1 base score is 4.6 (medium severity), reflecting the requirement for physical access but no privileges or user interaction. No known exploits have been reported in the wild, indicating limited current exploitation but a clear risk if devices are lost or stolen. This vulnerability highlights the risks associated with voice assistant features and the importance of secure state handling in such services.

The primary impact of CVE-2024-40840 is the unauthorized disclosure of sensitive user data on Apple iOS and iPadOS devices. Since the attacker must have physical access, the threat is particularly relevant in scenarios involving lost, stolen, or temporarily unattended devices. Confidentiality is compromised as sensitive information accessible via Siri can be extracted without unlocking the device. Integrity and availability are not directly affected. For organizations, this vulnerability could lead to data breaches involving employee or customer information if devices are not properly secured. The risk is heightened in environments where devices contain sensitive corporate data or are used for privileged communications. Although exploitation requires physical access, the lack of need for authentication or user interaction lowers the barrier for attackers who gain possession of a device. This could facilitate espionage, identity theft, or unauthorized data harvesting.

To mitigate CVE-2024-40840, organizations and users should immediately update all affected Apple devices to iOS 18 or iPadOS 18 or later, where the vulnerability is fixed. Additionally, enforcing strong physical security controls to prevent unauthorized access to devices is critical, including policies for device handling, storage, and transport. Enabling device encryption and strong passcodes can further reduce risk by limiting what Siri can access when the device is locked. Disabling Siri access from the lock screen can also mitigate exposure by preventing voice assistant activation without authentication. Organizations should implement mobile device management (MDM) solutions to enforce these settings and monitor device compliance. Training users on the risks of leaving devices unattended and the importance of prompt updates is also recommended. Finally, consider restricting sensitive data access on mobile devices or using secure containers to limit data exposure in case of physical compromise.