CVE-2025-55637 is a command injection vulnerability identified in the Reolink Smart 2K+ Plug-in Wi-Fi Video Doorbell with Chime, specifically affecting firmware version 3.0.0.4662_2503122283. The vulnerability resides in the setddns_pip_system() function, which likely handles dynamic DNS or related network configuration commands. Command injection vulnerabilities occur when untrusted input is improperly sanitized and passed to a system shell or command interpreter, allowing an attacker to execute arbitrary commands on the underlying operating system with the privileges of the affected application or device process. In this case, exploitation could allow an attacker to execute arbitrary commands remotely on the doorbell device, potentially leading to full device compromise. The lack of a CVSS score and absence of known exploits in the wild suggest this vulnerability was recently discovered and published on August 22, 2025. The vulnerability affects a consumer IoT device that is connected to home or small business networks, which may serve as an entry point into broader network environments if not properly segmented. The technical details are limited, but the critical aspect is that the vulnerability is in a network-facing function, which increases the risk of remote exploitation without user interaction. The firmware version affected is explicitly stated, but no patch links or mitigation details are provided, indicating that users and administrators should be vigilant for vendor updates or advisories. Given the nature of the device and vulnerability, attackers could leverage this flaw to gain persistent access, intercept video streams, manipulate device behavior, or pivot to other networked systems.

For European organizations, the impact of this vulnerability depends on the deployment context of the Reolink Smart 2K+ Wi-Fi Video Doorbell. While primarily a consumer device, these doorbells are also used in small offices, retail locations, and other organizational premises for physical security and access monitoring. Exploitation could lead to unauthorized command execution on the device, resulting in compromised device integrity and confidentiality breaches such as unauthorized video access or disabling of security features. Furthermore, the device could be used as a foothold to launch lateral attacks within the internal network, potentially exposing sensitive organizational data or disrupting operations. Given the increasing adoption of IoT devices in European businesses, this vulnerability poses a risk to network security posture, especially if network segmentation and device management policies are weak. Privacy regulations such as GDPR also heighten the consequences of unauthorized video or personal data exposure. Although no known exploits are reported, the ease of command injection exploitation typically makes this a high-risk vulnerability if left unpatched. Organizations relying on these devices for security monitoring should consider the risk of operational disruption and data leakage.

1. Immediate mitigation should include isolating the affected Reolink devices on a separate VLAN or network segment with strict firewall rules to limit their communication to only necessary services and prevent lateral movement. 2. Monitor network traffic for unusual activity originating from the doorbell devices, including unexpected outbound connections or command execution patterns. 3. Regularly check for firmware updates from Reolink and apply patches promptly once available. 4. Disable any unnecessary remote management features or services on the device to reduce the attack surface. 5. Employ network intrusion detection systems (NIDS) with signatures or anomaly detection tailored to IoT device behavior. 6. For organizations deploying these devices, implement strong authentication and access controls on device management interfaces. 7. Conduct periodic security assessments of IoT devices within the network to identify and remediate vulnerabilities proactively. 8. If possible, replace vulnerable devices with models that have a stronger security track record or vendor support.