CVE-2025-40755 is an SQL injection vulnerability classified under CWE-89, discovered in Siemens SINEC NMS, a network management system widely used in industrial and critical infrastructure environments. The vulnerability exists in the getTotalAndFilterCounts API endpoint, which improperly neutralizes special elements in SQL commands. This flaw allows an authenticated attacker with low privileges to inject malicious SQL code. The injection can be exploited to manipulate database queries, enabling unauthorized data insertion and privilege escalation within the application. The vulnerability has a CVSS 3.1 base score of 8.8, indicating high severity, with network attack vector, low attack complexity, and no user interaction required. The scope is unchanged, but the impact on confidentiality, integrity, and availability is high, as attackers can gain elevated privileges and potentially disrupt network management operations. No patches were available at the time of disclosure, and no public exploits have been reported, but the risk remains substantial due to the critical nature of the affected systems.

For European organizations, especially those in critical infrastructure sectors such as energy, manufacturing, and transportation that rely on Siemens SINEC NMS for network management, this vulnerability could lead to severe operational disruptions. Exploitation could allow attackers to escalate privileges, manipulate network management data, and potentially disrupt monitoring and control functions. This could result in unauthorized access to sensitive operational data, loss of system integrity, and denial of service conditions. Given Siemens' strong presence in Europe, the impact could extend to national infrastructure and industrial control systems, increasing the risk of cascading failures or targeted attacks against strategic assets. The high CVSS score reflects the potential for significant damage if exploited.

Organizations should immediately restrict access to the SINEC NMS management interfaces to trusted personnel and networks, implementing strict network segmentation and multi-factor authentication for all users. Monitor and audit all authenticated access to the getTotalAndFilterCounts endpoint for unusual activity. Employ web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting this endpoint. Siemens customers should prioritize upgrading to version 4.0 SP1 or later once patches are released. Until patches are available, consider disabling or limiting the vulnerable endpoint if feasible. Conduct thorough security assessments and penetration testing focused on this vulnerability. Additionally, maintain up-to-date backups and incident response plans tailored to industrial control system environments.