https://www.theverge.com/2017/10/16/16481136/wpa2-wi-fi-krack-vulnerability

At 8AM Monday morning Eastern Time, researchers plan to reveal details of a new exploit called KRACK that takes advantage of vulnerabilities in Wi-Fi security to let attackers eavesdrop on traffic between computers and wireless access points. The exploit, as noted by Ars Technica, takes advantage of several key management vulnerabilities in the WPA2 security protocol, the popular authentication scheme used to protect personal and enterprise Wi-Fi networks.

So yeah, this looks bad.