A new vulnerability has been discovered centered around a flaw in the WPA2 protocol that many wireless routers use for security.The proof-of-concept exploit is called KRACK and has been only discovered as a possible way for hackers to steal data over wireless connections. This has not been proven to be useful in a real-world situation but the possibility is present that a hacker could exploit this vulnerability. To protect yourself update the firmware on your wireless router/access point and update the software on your Android smartphones. You can read more about the vulnerability in this article: https://arstechnica.com/information-technology/2017/10/severe-flaw-in-wpa2-protocol-leaves-wi-fi-traffic-open-to-eavesdropping/