The Open Connectivity Foundation UPnP specification before 2020-04-17 does not forbid the acceptance of a subscription request with a delivery URL on a different network segment than the fully qualified event-subscription URL, aka the CallStranger issue.

HP has identified a security vulnerability with the I.R.I.S. OCR (Optical Character Recognition) software available with HP PageWide and OfficeJet printer software installations that could potentially allow unauthorized local code execution.