A Use of Hard-coded Password issue was discovered in Smiths Medical Medfusion 4000 Wireless Syringe Infusion Pump, Version 1.1, 1.5, and 1.6. Telnet on the pump uses hardcoded credentials, which can be used if the pump is configured to allow external communications. Smiths Medical assesses that it is not possible to upload files via Telnet and the impact of this vulnerability is limited to the communications module.