CVE-2021-27289

CRITICAL EPSS 50.1%
Published Apr 15, 20251y ago · Modified Jun 17, 20261w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Apr 15, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

A replay attack vulnerability was discovered in a Zigbee smart home kit manufactured by Ksix (Zigbee Gateway Module = v1.0.3, Door Sensor = v1.0.7, Motion Sensor = v1.0.12), where the Zigbee anti-replay mechanism - based on the frame counter field - is improperly implemented. As a result, an attacker within wireless range can resend captured packets with a higher sequence number, which the devices incorrectly accept as legitimate messages. This allows spoofed commands to be injected without authentication, triggering false alerts and misleading the user through notifications in the mobile application used to monitor the network.

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
50.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-294

References 6

  • github.com https://github.com/TheMalwareGuardian/CVE-2021-27289
  • packetstormsecurity.com https://packetstormsecurity.com/files/160331/Ksix-Zigbee-Devices-Playback-Protection-Bypass.html
  • exploit-db.com https://www.exploit-db.com/exploits/49169
  • youtube.com https://www.youtube.com/watch?v=5IFUpRKEioA
  • youtube.com https://www.youtube.com/watch?v=XFOy3wSlC9Q
  • youtube.com https://www.youtube.com/watch?v=yc9IEt5IMmA

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.