Millions of travelers are vulnerable to cyberattack if they join public Wi-Fi networks in airports, according to a new report by Coronet, a cybersecurity company. Here's what experts say to do to avoid cyberattack and what to do if you've joined a public Wi-Fi network in the past. Sam Hodgson | Bloomberg | Getty Images Travelers walk through San Diego International Airport in San Diego. There's a bigger danger lurking in U.S. airports than mediocre meals: public Wi-Fi networks. The convenience of these easy ways to connect online is often masked by the fact that many are unencrypted, insecure or improperly configured, according to a recent study by Coronet, a cybersecurity company. If that's the case, it is much easier for hackers to access your device and install malicious software, steal your passwords or login information and download other data such as emails. Hacking, which includes phishing, ransomware, malware and skimming, is the most common...