CVE-2025-66963 is a security vulnerability identified in the Hitron HI3120 device firmware version 7.2.4.5.2b1. The flaw allows a local attacker—someone with physical or local network access—to exploit the Logout option within the device's web interface (index.html) to obtain sensitive information. The exact nature of the sensitive information is not detailed, but it likely includes session tokens, credentials, or configuration data that could facilitate further unauthorized access or reconnaissance. The vulnerability does not require remote exploitation or user interaction beyond local access, limiting its attack surface. No CVSS score has been assigned yet, and no public exploits are known, indicating the issue is newly disclosed and may not be widely exploited. The vulnerability is classified as a confidentiality breach vector, as it exposes sensitive data without altering device functionality or availability. The lack of patch information suggests that a fix is pending or not yet publicly released. This vulnerability underscores the risks associated with local device management interfaces that may not adequately protect sensitive operations such as logout procedures, potentially leaking information that should be cleared or protected during session termination.

For European organizations, the impact of CVE-2025-66963 primarily concerns confidentiality risks related to sensitive information exposure on Hitron HI3120 devices. If an attacker gains local access—either physically or via a compromised local network—they could extract information that might facilitate further attacks, such as privilege escalation or lateral movement within the network. This could lead to unauthorized access to network infrastructure or customer data, especially in environments where these devices serve as gateways or network access points. The vulnerability does not directly affect device availability or integrity, so denial of service or data tampering risks are low. However, the exposure of sensitive information could undermine trust in network security and complicate compliance with data protection regulations like GDPR if personal or operational data is leaked. Organizations relying on Hitron HI3120 devices should consider the risk of insider threats or attackers who have breached perimeter defenses and gained local network access.

To mitigate CVE-2025-66963, European organizations should implement strict physical security controls to prevent unauthorized local access to Hitron HI3120 devices. Network segmentation should be employed to isolate management interfaces from general user networks, limiting access to trusted administrators only. Enforce strong authentication and access control policies on device management interfaces, including changing default credentials and using multi-factor authentication if supported. Monitor device logs and network traffic for unusual access patterns around the logout functionality or local interface usage. Since no patch is currently available, organizations should engage with Hitron or their vendors to obtain firmware updates addressing this vulnerability as soon as they are released. Additionally, consider deploying endpoint detection and response (EDR) solutions to detect suspicious local activity. Document and regularly review device configurations to ensure compliance with security best practices and reduce attack surface exposure.