CVE-2025-3916 is a stack-based buffer overflow vulnerability (CWE-121) identified in Schneider Electric's EcoStruxure™ Power Build Rapsody software, specifically affecting versions 2.7.12 FR and prior. This vulnerability arises when the software processes specially crafted project files with the .SSD extension. A local attacker can exploit this flaw by convincing an end user to open a malicious SSD project file, which triggers the buffer overflow condition on the stack. This overflow can potentially allow the attacker to execute arbitrary code within the context of the affected application. The vulnerability does not require elevated privileges or prior authentication but does require user interaction in the form of opening the malicious file. The CVSS 4.0 base score is 4.6 (medium severity), reflecting the local attack vector, low complexity, no privileges required, but requiring user interaction and having limited impact on confidentiality, integrity, and availability. No known exploits are currently reported in the wild, and no patches have been published yet. The vulnerability is significant because EcoStruxure Power Build Rapsody is used in industrial and power management environments, where unauthorized code execution could lead to disruption of critical infrastructure operations or manipulation of power system configurations.

For European organizations, especially those in the energy, utilities, and industrial automation sectors, this vulnerability poses a risk of unauthorized code execution on workstations running the affected software. Successful exploitation could lead to manipulation or disruption of power system configurations, potentially causing operational downtime or safety hazards. Although exploitation requires local access and user interaction, targeted spear-phishing or social engineering attacks could deliver malicious SSD files to operators or engineers. The impact on confidentiality is limited, but integrity and availability of power management configurations could be compromised, which is critical in regulated European energy markets. This could also lead to regulatory compliance issues under frameworks like NIS2 and GDPR if operational disruptions or data breaches occur. The absence of known exploits reduces immediate risk, but the critical nature of the affected systems warrants proactive mitigation.

European organizations should implement the following specific mitigations: 1) Restrict access to EcoStruxure Power Build Rapsody software to trusted personnel only and enforce strict user permissions to limit local access. 2) Educate users, especially engineers and operators, about the risks of opening unsolicited or unexpected SSD project files and implement policies to verify file sources before opening. 3) Employ application whitelisting and endpoint protection solutions capable of detecting anomalous behavior or code execution attempts originating from the software. 4) Monitor system logs and network activity for unusual patterns that could indicate exploitation attempts. 5) Coordinate with Schneider Electric for timely updates or patches and plan for rapid deployment once available. 6) Consider isolating systems running this software from broader corporate networks to reduce attack surface. 7) Implement strict file integrity monitoring on project files and related directories to detect unauthorized changes or additions.