CVE-2025-5872 is a security vulnerability identified in the eGauge EG3000 Energy Monitor, specifically version 3.6.3. The vulnerability arises from a missing authentication mechanism in a component referred to as the Setting Handler. This flaw allows an attacker to remotely initiate actions on the device without any authentication, meaning no credentials or user interaction are required to exploit it. The vulnerability is classified as problematic and has a CVSS 4.0 base score of 6.9, indicating a medium severity level. The attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact is limited to confidentiality (VC:L), with no impact on integrity or availability. The vendor was notified early but has not responded or provided a patch, and while the exploit has been publicly disclosed, there are no known exploits actively used in the wild at this time. The lack of authentication on a device that monitors energy usage could allow unauthorized parties to access sensitive operational data or potentially manipulate device settings remotely, which could have downstream effects on energy management systems relying on this data.

For European organizations, this vulnerability poses a risk primarily to facilities and infrastructure that utilize the eGauge EG3000 Energy Monitor for energy consumption tracking and management. Unauthorized remote access could lead to exposure of sensitive energy usage data, which might reveal operational patterns or business activities, impacting confidentiality. While the vulnerability does not directly affect system integrity or availability, the ability to manipulate settings without authentication could disrupt accurate energy monitoring or reporting, potentially affecting energy efficiency programs or compliance with energy regulations. In critical infrastructure sectors such as manufacturing, utilities, or data centers, inaccurate energy data could impair operational decision-making or trigger false alarms. Furthermore, the lack of vendor response and patch availability increases the window of exposure, necessitating proactive risk management by affected organizations.

Given the absence of an official patch, European organizations should implement compensating controls to mitigate this vulnerability. First, network segmentation should be enforced to isolate the EG3000 devices from untrusted networks, restricting access to trusted administrators only. Deploying firewall rules to limit inbound traffic to the device’s management interfaces can reduce exposure. Organizations should monitor network traffic for unusual access patterns to the energy monitors. If possible, disable remote management features until a patch is available. Employing VPNs or secure tunnels for remote access can add an authentication layer externally. Additionally, organizations should maintain an inventory of all EG3000 devices and verify their firmware versions to identify affected units. Regular audits and logging of device access can help detect unauthorized attempts. Finally, engaging with the vendor for updates or guidance and preparing for timely patch deployment once available is critical.