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CVE-2021-27289 is a replay attack vulnerability affecting a Ksix Zigbee smart home kit, including Zigbee Gateway Module v1.0.3, Door Sensor v1.0.7, and Motion Sensor v1.0.12. The vulnerability stems from an improper implementation of Zigbee's anti-replay protection based on the frame counter field. An attacker within wireless range can capture legitimate Zigbee packets and later retransmit them using a higher sequence number/frame counter value. Because the affected devices incorrectly accept these packets as valid, the attacker can inject spoofed commands without authentication. The issue enables falsification of device events and alerts presented to the user through the associated mobile monitoring application.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository documents and demonstrates CVE-2021-27289, a replay protection bypass vulnerability in Ksix Zigbee IoT devices. The main exploit is a Bash script that automates the process of modifying and replaying Zigbee packets with a forged sequence number, exploiting the improper implementation of replay protection (frame counter not checked). The exploit requires capturing a legitimate Zigbee packet (e.g., 'door open'), modifying its sequence number, reconstructing the packet, and replaying it to the network using tools like KillerBee. The repository includes detailed documentation, attack scenarios, lab setup, and a full thesis on Zigbee and Thread security. The exploit enables attackers within radio range to spoof events, deceive users, flood notifications, or trigger actions in industrial environments. The code is a proof-of-concept and not weaponized, but demonstrates a real-world impact on affected Ksix Zigbee devices. No hardcoded network endpoints are present, but the exploit targets Zigbee wireless communications at the MAC layer.
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Cross-references every affected SKU, including bundled OEM variants.
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