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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 17, 2019.[2] ESET estimates that this vulnerability affects over a billion devices.[3]


It was named Kr00k by Robert Lipovsky and Stefan Svorencik. 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 28, 2019 [1]
  • macOS Catalina 10.15.1, Security Update 2019-001, and Security Update 2019-006 - October 29, 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:


  1. ^ a b c "A serious vulnerability deep inside Wi-Fi encryption | ESET". Retrieved 2020-02-28.
  2. ^ "Kr00K vulnerability affects devices with Broadcom and Cypress Wi-Fi chips". xda-developers. 2020-02-27. Retrieved 2020-02-28.
  3. ^ a b[bare URL PDF]
  4. ^ "Kr00k, KRACK, and the Seams in Wi-Fi, IoT Encryption". Dark Reading. 12 August 2020. Retrieved 2020-08-14.
  5. ^ "KrØØk attack variants impact Qualcomm, MediaTek Wi-Fi chips". BleepingComputer. Retrieved 2020-08-07.
  6. ^ "Beyond KrØØk: Even more Wi‑Fi chips vulnerable to eavesdropping". WeLiveSecurity. 2020-08-06. Retrieved 2020-08-07.
  7. ^ Osborne, Charlie. "Cisco patches incoming to address Kr00k vulnerability impacting routers, firewall products". ZDNet. Retrieved 2020-02-28.
  8. ^ "Wi-Fi Protected Network and Wi-Fi Protected Network 2 Information Disclosure Vulnerability". Retrieved 2020-02-28.