CVE-2025-43205 is a security vulnerability identified in Apple watchOS and other Apple operating systems including tvOS, visionOS, iOS, and iPadOS. The root cause is an out-of-bounds memory access issue that allows an application to bypass Address Space Layout Randomization (ASLR), a critical security feature designed to randomize memory addresses used by system and application processes to prevent exploitation of memory corruption vulnerabilities. By bypassing ASLR, an attacker can predictably locate memory regions, facilitating further attacks such as arbitrary code execution or information leakage. The vulnerability was addressed by Apple through improved bounds checking in watchOS 11.4 and corresponding OS updates (tvOS 18.4, visionOS 2.4, iOS 18.4, iPadOS 18.4). The affected versions prior to these updates are vulnerable, though the exact impacted versions are unspecified. No public exploits or active exploitation have been reported to date. The vulnerability does not require user authentication but does require an app to be installed, which implies some level of user interaction or app vetting. The absence of a CVSS score necessitates an assessment based on impact and exploitability factors. Given that ASLR is a fundamental defense mechanism, its bypass significantly raises the risk profile of any subsequent attacks. This vulnerability is particularly relevant for environments where Apple wearable devices are used, including enterprise settings where sensitive data may be accessed or stored on such devices.

For European organizations, the impact of CVE-2025-43205 could be significant, especially in sectors where Apple devices, including Apple Watches, are integrated into business operations or employee workflows. Bypassing ASLR can enable attackers to execute arbitrary code or escalate privileges on affected devices, potentially leading to data breaches or unauthorized access to corporate networks if the device is used as a gateway or for authentication. This risk is heightened in industries such as finance, healthcare, and government, where sensitive information is handled and where Apple devices are increasingly common. Additionally, the vulnerability could be leveraged in targeted attacks against executives or employees using Apple wearables, facilitating espionage or lateral movement within networks. Although no exploits are currently known in the wild, the potential for future exploitation means organizations must act proactively. The impact extends beyond confidentiality to integrity and availability, as successful exploitation could disrupt device functionality or compromise system trust. Given the widespread use of Apple products in Europe, failure to patch could expose organizations to increased risk of sophisticated attacks.

European organizations should immediately verify the OS versions running on all Apple wearable devices and related Apple platforms within their environment. The primary mitigation is to update all affected devices to watchOS 11.4 or later, as well as the corresponding versions of tvOS, visionOS, iOS, and iPadOS where applicable. Organizations should enforce strict app installation policies, limiting installations to trusted sources such as the Apple App Store and employing Mobile Device Management (MDM) solutions to control app deployment. Monitoring for unusual app behavior or unauthorized app installations can help detect attempts to exploit this vulnerability. Additionally, organizations should educate users about the risks of installing untrusted applications and the importance of timely updates. Network segmentation and endpoint detection capabilities can further reduce the risk of lateral movement if a device is compromised. Finally, maintaining an inventory of Apple devices and ensuring compliance with patch management policies is critical to minimizing exposure.