A security flaw in the WPA2 protocol, used to secure modern Wi-Fi networks, was disclosed by Belgian researchers on October 16, 2017, exposing millions of devices to potential eavesdropping and attacks. This vulnerability stems from a combination of weaknesses in the WPA2 specification and its implementation, allowing attackers to intercept and potentially inject data into wireless network traffic across various operating systems, including Linux, Windows, iOS, Android, and BSD. The flaw facilitates three types of attacks: compromising broadcast messages, targeting client devices, and exploiting access points, with the latter two enabling attackers to listen to and manipulate data traffic. Users are advised to protect themselves by installing security patches, using wired connections when possible, disabling certain features like 802.11r, and employing application-level security such as HTTPS and VPNs. The attack requires proximity to the targeted Wi-Fi network, and while mobile devices are particularly at risk due to their automatic connection to different networks, companies should ensure devices are patched or have Wi-Fi disabled until a fix is applied.