CVE-2018-8870 in MyCareLink Patient Monitor
Summary
by MITRE
Medtronic MyCareLink Patient Monitor, 24950 MyCareLink Monitor, all versions, and 24952 MyCareLink Monitor, all versions contains a hard-coded operating system password. An attacker with physical access can remove the case of the device, connect to the debug port, and use the password to gain privileged access to the operating system.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 05/22/2025
The Medtronic MyCareLink Patient Monitor series represents a critical class of medical devices designed for remote patient monitoring and data collection in healthcare environments. These devices serve as essential components in managing patient care through continuous monitoring of vital signs and medical device status. The vulnerability identified in CVE-2018-8870 specifically affects the 24950 MyCareLink Monitor and 24952 MyCareLink Monitor models across all software versions, creating a significant security risk that directly impacts patient safety and data confidentiality. This flaw resides in the fundamental design of the device's operating system, where a hard-coded password has been embedded within the system configuration, violating core security principles of credential management and device isolation.
The technical implementation of this vulnerability stems from the inclusion of a hardcoded password within the device's operating system firmware, which serves as a backdoor mechanism for authorized maintenance personnel. This hard-coded credential exists within the device's debug interface, which is typically intended for authorized service technicians and system administrators. However, the security model fails to adequately protect this access point, as physical access to the device allows an attacker to bypass normal authentication procedures. The debug port serves as a direct hardware interface to the device's operating system, enabling low-level access that can bypass standard security controls and user authentication mechanisms. This vulnerability directly maps to CWE-798, which identifies the use of hard-coded credentials as a significant security weakness, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter execution through direct system access.
The operational impact of this vulnerability extends far beyond simple unauthorized access to device functionality. An attacker with physical access can exploit this weakness to gain root-level privileges on the device's operating system, potentially enabling them to modify patient data, alter monitoring parameters, or disrupt critical medical operations. This access could result in life-threatening situations where device functionality is compromised, patient monitoring is disrupted, or malicious data is injected into the medical system. The vulnerability creates a persistent threat vector that cannot be mitigated through network-based security measures alone, as it requires physical access to the device itself. Healthcare organizations must consider the implications of this vulnerability in their risk assessments, particularly in environments where physical security controls may be inadequate or where unauthorized individuals might gain access to medical devices.
Mitigation strategies for this vulnerability require a multi-layered approach focusing on both physical and operational security measures. Organizations should implement strict physical access controls around medical devices, including secure storage areas, access logging, and regular security audits of device locations. The immediate remediation involves updating device firmware to remove the hard-coded password where possible, though this may not be feasible for all affected models. Network segmentation and monitoring should be implemented to detect anomalous access patterns, while regular security assessments should include physical security reviews of medical device deployments. The vulnerability highlights the importance of following security standards such as NIST SP 800-82 for industrial control systems and ISO/IEC 27001 for information security management. Additionally, organizations should consider implementing device integrity monitoring solutions that can detect unauthorized modifications or access attempts to medical devices, as this vulnerability represents a classic example of insufficient security by design in medical device architecture.