ICS-CERT has issued an alert warning that a certain software that manages electronic highways signs contains a vulnerability that makes such signs susceptible to hacking. Daktronics Vanguard dynamic highway message sign configuration software was initially said to contain hard-coded credentials last week. The company that manufactures the software has contested that claim, saying that the credentials are merely default credentials that can be changed by the person in charge of maintaining the signs running on the Vanguard software. In order to remedy the problem, Daktronic and the Federal Highway Administration are advising that Vanguard displays are not present on publicly accessible IP addresses.
Source: https://threatpost.com/ics-cert-warns-of-easily-hackable-road-signs/106529/