Cybersecurity firm ESET reported in February that billions of Wi-Fi-capable devices may have been at one point affected by a vulnerability that could have been exploited to obtain sensitive information from wireless communications.

The security hole, named Kr00k and tracked as CVE-2019-15126, caused affected devices to use an all-zero encryption key to encrypt some of a user’s communications. This enabled a malicious actor to decrypt some of the packets transmitted by these devices.New Kr00k vulnerabilities found

Kr00k attacks can be launched when a disassociation occurs. That is when a device is disconnected from a wireless network due to switching access points, signal interference, or when the Wi-Fi feature is disabled.