CVE-2025-29660 is a critical vulnerability identified in the daemon process of the Yi IOT XY-3820 device, version 6.0.24.10. This device exposes a TCP service on port 6789 which suffers from improper input validation. Specifically, the vulnerability arises due to the lack of sanitization of incoming TCP requests, allowing attackers to leverage directory traversal techniques to execute arbitrary scripts present on the device. Directory traversal (CWE-22) enables attackers to access files and directories outside the intended scope, potentially leading to unauthorized code execution. Since the daemon runs with sufficient privileges to execute scripts, an attacker can remotely send crafted TCP packets that traverse directories and invoke scripts, resulting in full compromise of the device. The vulnerability requires no authentication or user interaction and can be exploited remotely over the network, increasing its risk profile. The CVSS 3.1 base score of 9.8 reflects the critical nature of this flaw, with high impact on confidentiality, integrity, and availability. Although no known exploits have been reported in the wild yet, the ease of exploitation and the critical impact make this a significant threat to any environment deploying the Yi IOT XY-3820 devices. The lack of vendor or product-specific details limits precise identification, but the vulnerability is clearly tied to this specific IoT device and its daemon service on port 6789.

For European organizations, the exploitation of CVE-2025-29660 could have severe consequences, especially for those relying on the Yi IOT XY-3820 devices in operational technology (OT), smart building management, or industrial IoT environments. Successful exploitation can lead to full device compromise, allowing attackers to execute arbitrary code, potentially pivot within internal networks, exfiltrate sensitive data, disrupt device functionality, or use the compromised devices as footholds for broader attacks. Given the criticality of IoT devices in sectors such as manufacturing, energy, healthcare, and smart cities, this vulnerability could disrupt essential services and cause operational downtime. Moreover, compromised devices could be leveraged in botnets or for launching distributed denial-of-service (DDoS) attacks, further amplifying the impact. The lack of authentication and remote exploitability means attackers can target these devices from anywhere, increasing the attack surface. The vulnerability also poses compliance risks under European data protection regulations if exploited to access or leak personal or sensitive data.

1. Immediate network segmentation: Isolate Yi IOT XY-3820 devices on dedicated network segments with strict access controls to limit exposure to untrusted networks. 2. Restrict access to TCP port 6789: Implement firewall rules to block or tightly control inbound traffic to port 6789, allowing only trusted management hosts. 3. Monitor network traffic for anomalous TCP requests targeting port 6789, especially those containing directory traversal patterns (e.g., '../'). 4. Disable or restrict the vulnerable daemon service if possible until a vendor patch is available. 5. Engage with the device vendor or supplier to obtain firmware updates or patches addressing this vulnerability; if none are available, consider device replacement or additional compensating controls. 6. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect exploitation attempts targeting this vulnerability. 7. Conduct regular vulnerability assessments and penetration tests focusing on IoT devices to identify similar weaknesses. 8. Maintain an asset inventory to identify all deployed Yi IOT XY-3820 devices and prioritize remediation efforts accordingly.