Kr00k
Kr00k is an information disclosure vulnerability in Broadcom and Cypress FullMAC Wi-Fi chipsets, tracked as CVE-2019-15126. After a Wi-Fi disassociation event, affected devices can enter an erroneous state-transition condition in which subsequent unicast data frames are encrypted with an all-zero Temporal Key instead of the negotiated WPA2 session key. This affects WPA2-Personal and WPA2-Enterprise deployments using AES-CCMP. An attacker in radio range can capture those frames and decrypt the affected traffic without knowing the network password or session keys. The issue impacts both client devices and wireless infrastructure such as access points and routers using vulnerable chipsets.
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Impact, mitigation & remediation
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos (1 hidden).
This repository contains a proof-of-concept exploit for the KR00K vulnerability (CVE-2019-15126), which affects certain Wi-Fi chips (notably Broadcom and Cypress) in both access points and clients. The exploit consists of a single Python script, 'kr00ker.py', and a README file. The script requires a wireless interface in monitor mode and uses the 'scapy' and 'Cryptodome' Python libraries. It works by sending disassociation frames to the target device (either AP or client), which may cause the device to enter a vulnerable state where it uses an all-zero temporal key (TK) for WPA2 CCMP encryption. The script then captures WPA2 CCMP packets and attempts to decrypt them using this key. If successful, decrypted data is displayed and saved to a pcap file. The README provides detailed usage instructions, prerequisites, and example commands. The exploit is a functional proof-of-concept and does not include weaponized or automated payloads beyond the described attack flow.
This repository provides a proof-of-concept (PoC) exploit for CVE-2019-15126, also known as the 'kr00k' vulnerability, which affects certain Broadcom and Cypress WiFi chips. The main exploit script, 'r00kie-kr00kie.py', enables an attacker with a compatible WiFi card (supporting monitor mode and frame injection) to perform a deauthentication attack against a victim, capture encrypted WiFi packets, and then decrypt them by exploiting the kr00k vulnerability. The decrypted packets are saved to a PCAP file for analysis. The script requires the attacker to specify the wireless interface, channel, BSSID (AP MAC), and client MAC address. The repository also includes 'traffic_generator.py', a helper script to generate UDP traffic (by default to 8.8.8.8:53) from the victim, which can be used to demonstrate the exploit's effectiveness. The exploit is written in Python and depends on 'scapy' and 'pycryptodomex'. The repository is structured with clear separation between the main exploit, traffic generation, and documentation. No fake or malicious code is present; this is a legitimate PoC for research and educational purposes.
Affected products & vendors
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Recent activity
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A firmware vulnerability affecting Wi-Fi devices that can cause transmissions to be encrypted with an all-zero key, enabling easy decryption of traffic.
A Wi‑Fi (WPA2) information disclosure/decryption vulnerability in certain Wi‑Fi chip implementations (initially Broadcom and Cypress; similar issues later noted in Qualcomm and MediaTek) that can allow decryption of some WPA2-encrypted traffic, potentially enabling eavesdropping.
A Wi-Fi chip vulnerability in Broadcom and Cypress FullMac chips that can cause devices to use an all-zero Temporal Key after disassociation, allowing unauthorized decryption of some WPA2-encrypted network traffic.
A Wi-Fi chip vulnerability in Broadcom and Cypress chipsets that can cause devices to use an all-zero encryption key for part of WPA2 traffic, allowing an attacker to decrypt some wireless network packets.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.