CVE-2026-18844 in Vagus Nerve Stimulator
Summary
by MITRE • 08/11/2026
The firmware of the Pulsetto Vagus Nerve Stimulator accepts several undisclosed commands over its Bluetooth Low Energy (BLE) interface. These commands are sent without authentication or encryption, and are never issued by the companion mobile application, yet are fully processed by the device when it is powered on.
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Analysis
by VulDB Data Team • 08/11/2026
The Pulsetto Vagus Nerve Stimulator represents a critical medical device that delivers therapeutic electrical stimulation to patients suffering from various neurological conditions including epilepsy and depression. This device operates through a sophisticated firmware architecture that communicates with companion mobile applications via Bluetooth Low Energy protocols to facilitate patient monitoring and treatment adjustments. The vulnerability lies within the device's firmware implementation where it accepts multiple undisclosed commands through its BLE interface without any form of authentication or encryption mechanisms. These commands are not part of the legitimate communication protocol established between the device and its authorized mobile application, yet they remain fully functional and executable when the device is powered on. This fundamental flaw creates a persistent attack surface that remains active regardless of whether the device is in use or idle.
The technical nature of this vulnerability stems from improper input validation and lack of access control mechanisms within the device's firmware architecture. According to CWE-284 Access Control, the device fails to properly enforce authorization controls for its BLE interface, allowing any nearby attacker with appropriate BLE capabilities to issue commands that should only be accessible through legitimate authenticated channels. The absence of encryption means that all communication between unauthorized parties and the device can be intercepted and manipulated, while the lack of authentication creates a scenario where attackers can perform arbitrary operations on the device without proving their authorization. This vulnerability is particularly concerning as it exists at the firmware level, meaning it cannot be mitigated through software patches alone but requires either hardware modifications or complete firmware reimplementation.
The operational impact of this vulnerability extends far beyond simple unauthorized access to device controls. Medical devices like the Pulsetto Vagus Nerve Stimulator are designed to deliver precise electrical stimulation to patients and any disruption in their operation could result in serious health consequences. Attackers with access to these undisclosed commands could potentially modify treatment parameters, disable safety mechanisms, or even cause the device to deliver harmful electrical pulses to patients. The fact that these commands are processed when the device is powered on means that an attacker only needs to be within BLE range of a patient's device to potentially compromise their therapy. This vulnerability directly impacts patient safety and could lead to treatment failures, device malfunctions, or even life-threatening situations depending on how the unauthorized commands are executed.
The attack surface for this vulnerability aligns with several tactics identified in the MITRE ATT&CK framework under the T1046 Network Service Scanning and T1566 Phishing categories. An attacker could potentially use BLE scanning tools to identify vulnerable devices within range and then exploit these undisclosed commands to gain control over the device's operational parameters. The lack of proper authentication mechanisms means that the attack requires minimal credentials or specialized knowledge, making it accessible to a broad range of threat actors. This vulnerability also presents significant challenges for incident response and forensic analysis since the unauthorized commands would appear as legitimate device operations within system logs. Organizations should implement comprehensive network monitoring solutions that can detect anomalous BLE traffic patterns and establish robust device lifecycle management protocols.
Mitigation strategies for this vulnerability must address both immediate security concerns and long-term device integrity requirements. The most effective approach involves implementing proper authentication mechanisms at the firmware level, ensuring all BLE commands are validated against authorized sources before execution. This includes establishing secure key exchange protocols and implementing end-to-end encryption for all communications between the device and legitimate mobile applications. Device manufacturers should also implement command whitelisting where only pre-approved sequences of operations can be executed through the BLE interface. Regular security audits and penetration testing should be conducted to identify additional undiscovered command sequences that could pose similar risks. The vulnerability also highlights the importance of secure development lifecycle practices and adherence to medical device security standards such as those outlined in ISO 13485 and IEC 62401, which provide guidelines for cybersecurity in medical devices.
The presence of these undisclosed commands without proper access controls represents a critical gap in the device's security architecture that directly violates fundamental principles of secure embedded system design. This vulnerability demonstrates how the lack of proper authentication and encryption mechanisms can create persistent security risks even in highly regulated industries such as healthcare. The implications extend beyond individual patient safety to encompass broader concerns about medical device cybersecurity, regulatory compliance, and the trust that patients place in life-saving technologies. Organizations must prioritize comprehensive risk assessments for all connected medical devices and implement robust security controls to prevent similar vulnerabilities from being exploited in the future.