CVE-2025-4386

Vulnerability

Overview

The Medtronic MyCareLink Patient Monitor (models 24950 and 24952) exposes an internal serial interface that is accessible via a UART terminal. This interface presents a login prompt to an attacker who has gained physical access to the device [1][2]. The vulnerability is assigned CVE-2025-4386 and is part of a broader set of physical-access flaws affecting these monitors [1].

Attack

Vector and Requirements

Exploitation requires the attacker to physically tamper with the monitor to connect to the serial/UART interface [2]. No additional authentication is needed at the interface level; the mere presence of the login prompt provides an entry point for further attacks, such as brute-forcing or exploiting empty-password accounts (CVE-2025VE-2025-4395) [1]. The monitor is used in home and clinical settings for remote cardiac device data transmission [2].

Potential

Impact

While exploitation of low risk according to Medtronic, successful exploitation could lead to system compromise, unauthorized access to sensitive patient data, and manipulation of the monitor's functionality [1][2]. Medtronic states that direct patient harm is not expected from this vulnerability alone [2].

Mitigation

Status

Medtronic began deploying automatic security updates via internet connection starting in June 2025 [2]. The CISA advisory lists both affected models (24950 and 24952) as known-affected, and users are advised to ensure their monitors remain connected to receive updates [1][2].