CVE-2025-11918 is a stack-based buffer overflow vulnerability classified under CWE-121, affecting Rockwell Automation Arena® Simulation software versions 16.20.10 and prior. The vulnerability exists in the way Arena® parses DOE files, which are used within the simulation environment. When a specially crafted DOE file is opened, the buffer overflow can be triggered, allowing a local attacker to execute arbitrary code with the privileges of the user running the application. The attack vector requires local access and user interaction (opening the malicious DOE file), but no authentication is necessary. The vulnerability impacts confidentiality, integrity, and availability by enabling code execution that could lead to system compromise or disruption of simulation processes. The CVSS 4.0 vector indicates a local attack vector with high complexity and no privileges required, but user interaction is necessary. No public exploits or patches have been reported as of the publication date, but the vulnerability is publicly disclosed and should be treated with urgency due to the critical nature of industrial simulation environments. The flaw could be leveraged to disrupt industrial planning, cause erroneous simulation results, or serve as a foothold for further attacks within operational technology environments.

For European organizations, especially those involved in industrial automation, manufacturing, and process simulation, this vulnerability poses a significant risk. Arena® Simulation is used to model and optimize industrial processes; compromise could lead to manipulation of simulation data, resulting in flawed operational decisions. This can cause production inefficiencies, safety hazards, or financial losses. Additionally, arbitrary code execution could allow attackers to pivot into broader operational technology networks, potentially disrupting critical infrastructure. Confidentiality of proprietary simulation models and intellectual property may also be at risk. Given the local attack vector, insider threats or compromised user accounts could exploit this vulnerability. The lack of current public exploits reduces immediate risk but does not eliminate the threat, especially as attackers may develop exploits post-disclosure. The high CVSS score reflects the potential for serious operational and security impacts if exploited.

Organizations should implement strict controls on DOE file handling, including restricting file sources and scanning files for anomalies before opening. Until a vendor patch is released, consider isolating Arena® Simulation environments from general user workstations and limiting user privileges to reduce the risk of exploitation. Employ application whitelisting to prevent unauthorized code execution and use endpoint detection and response (EDR) tools to monitor for suspicious activity related to Arena®. Conduct user awareness training to highlight the risks of opening untrusted DOE files. Regularly back up simulation data and maintain incident response plans tailored to operational technology environments. Coordinate with Rockwell Automation for timely patch deployment once available and monitor threat intelligence feeds for emerging exploit information. Network segmentation between IT and OT environments can limit lateral movement if exploitation occurs.