Remote unauthorized access
Potential security vulnerabilities have been identified with certain HP LaserJet Pro 400 Multifunction Printers (MFP). The vulnerabilities could be remotely exploited to allow unauthorized access.
HP has provided firmware updates to resolve the vulnerabilities for each impacted HP LaserJet Pro 400 device. To obtain the updated firmware, go to the HP Software and Drivers page for your product and find the firmware update from the list of available software.