A devastating flaw in Wi-Fi’s WPA security protocol makes it possible for attackers to eavesdrop on your data when you connect to Wi-Fi. Dubbed KRACK, the issue affects the Wi-Fi protocol itself—not specific products or implementations—and “works against all modern protected Wi-Fi networks,” according to Mathy Vanhoef, the researcher that discovered it. That means that if your device uses Wi-Fi, KRACK likely impacts it. Fortunately, major tech companies are moving quickly to patch the issue.

Read on for what you need to know about the KRACK Wi-Fi vulnerability, from how it works to how to best protect yourself against it. We’ll repeatedly update this article as more information becomes available.