CVE-2025-4393 is a vulnerability classified under CWE-502 (Deserialization of Untrusted Data) affecting Medtronic MyCareLink Patient Monitor models 24950 and 24952 prior to June 25, 2025. The issue arises from an internal service within the device that deserializes binary data without proper validation or sanitization. An attacker with local access can craft a malicious binary payload that, when processed by this service, can cause the service to crash (denial of service) or escalate privileges, potentially gaining higher-level access on the device. The vulnerability requires local access (attack vector: local), high attack complexity, and low privileges but does not require user interaction. The CVSS v3.1 base score is 6.5, reflecting medium severity, with impacts on confidentiality (limited), integrity (high), and availability (high). The scope remains unchanged, indicating the vulnerability affects only the vulnerable component. No patches or exploit code are currently publicly available, and no known exploits in the wild have been reported. Given the critical role of these patient monitors in healthcare settings, exploitation could disrupt patient monitoring, compromise sensitive health data, or allow unauthorized control over device functions.

The vulnerability poses significant risks to healthcare organizations and patients relying on Medtronic MyCareLink Patient Monitors. Successful exploitation could lead to denial of service by crashing the monitoring service, potentially interrupting continuous patient monitoring and endangering patient safety. Privilege escalation could allow attackers to manipulate device operations or access sensitive patient data, impacting confidentiality and integrity. Such disruptions could delay medical responses or result in incorrect clinical decisions. The requirement for local access limits remote exploitation but insider threats or attackers gaining physical or network access to the device environment remain concerns. The impact extends to healthcare providers, hospitals, and clinics using these devices, potentially affecting patient trust and regulatory compliance. Additionally, the disruption of critical medical devices could have cascading effects on healthcare delivery and emergency response capabilities.

Organizations should implement strict physical and network access controls to limit local access to the affected devices, including securing device locations and restricting administrative privileges. Network segmentation should isolate patient monitors from general IT networks to reduce attack surface. Monitoring and logging of device activity can help detect anomalous behavior indicative of exploitation attempts. Medtronic should be engaged to provide patches or firmware updates addressing this vulnerability; until then, applying any available vendor-recommended mitigations is critical. Device operators should follow best practices for device hardening, including disabling unnecessary services and enforcing strong authentication for local access. Regular security assessments and penetration testing in healthcare environments can identify potential exploitation paths. Incident response plans should include procedures for medical device compromise scenarios to minimize patient risk.