CVE-2025-6529 is a critical vulnerability identified in the 70mai M300 device, specifically affecting the Telnet service component in firmware versions up to 20250611. The vulnerability arises from the use of default credentials that are hardcoded or preset within the Telnet service, allowing an attacker to gain unauthorized access without needing to guess or brute-force passwords. Exploitation requires the attacker to be on the same local network as the vulnerable device, as the Telnet service is typically not exposed externally by default. The vulnerability does not require any user interaction or prior authentication, making it straightforward to exploit once network access is obtained. The CVSS 4.0 score of 8.7 (high severity) reflects the ease of exploitation (low attack complexity), no privileges required, and the significant impact on confidentiality, integrity, and availability. The Telnet service, being a remote command-line interface, can allow an attacker to execute arbitrary commands, potentially leading to full device compromise, data leakage, or disruption of device functionality. The vendor was notified early but has not responded or issued patches, and while no known exploits are currently observed in the wild, public disclosure of the exploit details increases the risk of imminent attacks. The lack of patch availability and vendor engagement exacerbates the threat landscape for users of the 70mai M300 device.

For European organizations, the impact of this vulnerability can be significant, especially for those using 70mai M300 devices within their local networks. These devices are commonly used as dashcams or IoT peripherals, often connected to corporate or private networks. An attacker gaining access via this vulnerability could pivot into broader network segments, potentially accessing sensitive data or disrupting operations. Confidentiality is at risk due to unauthorized access to device data or network traffic. Integrity could be compromised if attackers alter device configurations or inject malicious commands. Availability may be affected if the device is rendered inoperable or used as a foothold for further attacks such as lateral movement or launching denial-of-service attacks. The local network access requirement limits the attack surface but does not eliminate risk, particularly in environments with weak network segmentation or guest Wi-Fi access. The absence of vendor patches means organizations must rely on compensating controls, increasing operational overhead and risk exposure. Additionally, the public disclosure of exploit details raises the likelihood of opportunistic attacks targeting European entities using these devices.

To mitigate this vulnerability effectively, European organizations should implement the following specific measures: 1) Immediately isolate 70mai M300 devices on segmented VLANs or dedicated IoT networks with strict access controls to prevent unauthorized local network access. 2) Disable the Telnet service on the devices if possible, or block Telnet ports (typically TCP 23) at network firewalls and switches to prevent access. 3) Monitor local network traffic for unusual Telnet connection attempts or unauthorized access patterns targeting these devices. 4) Enforce strict network access policies, including disabling guest network access to internal segments where these devices reside. 5) If device replacement is feasible, consider migrating to alternative products with active vendor support and no known vulnerabilities. 6) Maintain an inventory of all 70mai M300 devices to ensure full visibility and control. 7) Engage with the vendor for updates or patches, and subscribe to threat intelligence feeds for emerging exploit information. 8) Implement network intrusion detection systems (NIDS) tuned to detect Telnet-based attacks and anomalous behavior. These measures go beyond generic advice by focusing on network segmentation, service disabling, and active monitoring tailored to the specific vulnerability and device context.