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CVE identifier(s)CVE-2019-15126
Date discovered2019
Affected hardwareMany devices with Broadcom and Cypress Semiconductor Wi-Fi chips including smartphones, tablets and single-board computers

Kr00k (also written as KrØØk) is a security vulnerability that allows some WPA2 encrypted WiFi traffic to be decrypted.[1] The vulnerability was originally discovered by security company ESET in 2019 and assigned CVE-2019-15126 on August 17th, 2019.[2] ESET estimates that this vulnerability affects over a billion devices.[3]


Kr00k was discovered by ESET Experimental Research and Detection Team, most prominently ESET security researcher Miloš Čermák.[1]

It was named Kr00k by Robert Lipovský and Štefan Svorenčík. It was discovered when trying variations of the KRACK attack.[4]

Initially found in chips made by Broadcom and Cypress, similar vulnerabilities have been found in other implementations, including those by Qualcomm and MediaTek.[5][6]


The vulnerability is known to be patched in:

  • iOS 13.2 and iPadOS 13.2 - October 28th, 2019 [1]
  • macOS Catalina 10.15.1, Security Update 2019–001, and Security Update 2019-006 - October 29th, 2019 [1]

Vulnerable devices[edit]

During their research, ESET confirmed over a dozen popular devices were vulnerable.[3]

Cisco has found several of their devices to be vulnerable and are working on patches.[7] They are tracking the issue with advisory id cisco-sa-20200226-wi-fi-info-disclosure.[8]

Known vulnerable devices include: