CVE-2025-4395 identifies a security vulnerability in Medtronic MyCareLink Patient Monitor models 24950 and 24952, specifically in devices produced before June 25, 2025. The vulnerability arises from a built-in user account configured with an empty password, classified under CWE-258 (Use of a Hard-coded or Empty Password). This configuration flaw allows an attacker who gains physical access to the device to log in without any authentication. Once logged in, the attacker can modify system functionality, which may include altering device settings, disrupting monitoring operations, or accessing sensitive patient data. The vulnerability does not require network access, remote exploitation, or user interaction, but physical access is mandatory. The CVSS v3.1 base score is 6.8, with the vector indicating physical attack vector (AV:P), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). No patches or exploits are currently reported, but the risk remains significant due to the critical nature of medical devices and the potential consequences of unauthorized modifications. The vulnerability highlights the importance of secure default configurations and robust access controls in medical device design.

The impact of CVE-2025-4395 is substantial for healthcare organizations and patients relying on Medtronic MyCareLink Patient Monitors. Unauthorized physical access to the device can lead to compromise of patient data confidentiality, unauthorized modification of device settings, and disruption of monitoring functions, potentially endangering patient health and safety. The integrity of the device's operation can be undermined, leading to inaccurate monitoring or failure to alert medical personnel of critical conditions. Availability may also be affected if the attacker disables or alters device functionality. Given the critical role of these devices in patient care, exploitation could result in severe clinical consequences and liability issues for healthcare providers. The requirement for physical access limits the attack scope but does not eliminate risk, especially in environments where devices are accessible to unauthorized personnel or insufficiently secured. The absence of known exploits reduces immediate threat but does not preclude future attacks. Overall, the vulnerability poses a moderate to high risk to patient safety and healthcare operational integrity.

To mitigate CVE-2025-4395, healthcare providers should implement strict physical security controls to prevent unauthorized access to Medtronic MyCareLink Patient Monitors, including secure placement, locked enclosures, and controlled access areas. Inventory and identify affected devices, focusing on models 24950 and 24952 manufactured before June 25, 2025. Engage with Medtronic for any available firmware updates, patches, or configuration guidance to eliminate or change the empty password account. If no patch is available, consider device replacement or disabling the vulnerable account if supported by the device. Implement monitoring and auditing procedures to detect unauthorized physical access or configuration changes. Train staff on the importance of device security and reporting suspicious activity. Additionally, segregate medical device networks from general IT networks to limit attack vectors. Document and enforce policies for device handling and maintenance to minimize exposure. Regularly review and update security posture as new information or patches become available.