CVE-2025-4528 is a medium-severity vulnerability affecting Dígitro NGC Explorer versions up to 3.44.15. The vulnerability involves a session expiration issue that can be triggered remotely without requiring user interaction or authentication. Specifically, an attacker can manipulate certain unknown processing aspects within the application to forcibly expire active user sessions. This could disrupt legitimate user activities by terminating their sessions unexpectedly. The CVSS 4.0 base score is 5.3, reflecting a network attack vector with low complexity and no privileges or user interaction required. The impact on confidentiality and integrity is minimal, but availability is partially impacted due to session interruptions. The vendor has not responded to disclosure attempts, and no patches or known exploits have been reported yet. The vulnerability does not appear to allow session hijacking or privilege escalation but could be leveraged to cause denial of service to users by forcing session termination remotely.

For European organizations using Dígitro NGC Explorer, this vulnerability could lead to operational disruptions by causing unexpected session expirations. This may affect productivity, especially in environments where continuous access to the application is critical. While the vulnerability does not directly compromise sensitive data or system integrity, repeated forced logouts could result in loss of unsaved work or interrupt time-sensitive processes. In sectors such as finance, utilities, or critical infrastructure where Dígitro products might be deployed, this could degrade service reliability and user experience. Additionally, if exploited as part of a broader attack chain, it could serve as a denial-of-service vector against key personnel. The lack of vendor response and absence of patches increases the risk exposure until mitigations are implemented.

Organizations should implement network-level protections such as firewall rules to restrict access to Dígitro NGC Explorer interfaces only to trusted IP addresses and internal networks. Monitoring and anomaly detection should be enhanced to identify unusual session terminations or repeated session expiration events. Where possible, session timeout and expiration policies should be reviewed and adjusted to minimize disruption. Employing VPNs or zero-trust network access can reduce exposure to remote attackers. Since no patches are currently available, organizations should consider isolating the affected application from public internet access and applying strict access controls. Regular backups of session state or work-in-progress data can help mitigate data loss from forced logouts. Finally, organizations should maintain close communication with the vendor for updates and apply patches promptly once released.