CVE-2025-4687 is a high-severity vulnerability affecting Teltonika Networks Remote Management System (RMS) versions prior to 5.7. The vulnerability arises from improper handling of the invite functionality within the platform. Specifically, an attacker can exploit the account pre-hijacking flaw by sending an invite to a victim's email address. If the victim registers directly on the RMS platform while the invite is still pending, the system erroneously associates the victim's new account with the attacker's company rather than creating a separate, legitimate account. This results in the attacker gaining unauthorized management capabilities over the victim's account and the associated company resources. The vulnerability is classified under CWE-288 (Authentication Bypass Using an Alternate Path or Channel), indicating a bypass of intended authentication or authorization controls. The CVSS 4.0 base score of 7.2 reflects a high severity, with network attack vector, low attack complexity, partial privileges required, and user interaction needed. The impact on confidentiality, integrity, and availability is high, as the attacker can manage company resources and potentially manipulate or exfiltrate sensitive data. No known exploits are currently reported in the wild, and no patches are linked yet, suggesting the need for immediate attention from affected organizations.

For European organizations using Teltonika Networks RMS, this vulnerability poses significant risks. RMS is commonly used for managing network devices remotely, including routers and IoT gateways, which are critical for operational continuity. Unauthorized access to company accounts could lead to manipulation of network configurations, exposure of sensitive operational data, and disruption of network services. Given the nature of the vulnerability, attackers could stealthily gain persistent access without the victim's awareness, increasing the risk of prolonged compromise. This could affect industries relying on Teltonika devices for critical infrastructure management, such as manufacturing, logistics, and telecommunications. The breach of network management systems could also contravene GDPR requirements regarding data protection and incident reporting, leading to regulatory and reputational consequences.

Organizations should immediately verify if they are running RMS versions prior to 5.7 and plan for an upgrade to the latest patched version once available. Until a patch is released, administrators should disable or restrict the invite functionality to prevent unsolicited invitations. Implement strict monitoring of account creation and company membership changes within RMS to detect anomalous activities. Employ multi-factor authentication (MFA) for all RMS accounts to reduce the risk of unauthorized access. Additionally, organizations should educate users about the risks of registering accounts from unsolicited invites and encourage verification of invitation legitimacy. Network segmentation and limiting RMS administrative access to trusted IP ranges can further reduce exposure. Finally, maintain an incident response plan tailored to potential RMS compromises to enable rapid containment and remediation.