CVE-2025-59299 is an out-of-bounds write vulnerability classified under CWE-787 affecting Delta Electronics' DIAScreen software. The root cause is the lack of proper validation of user-supplied files, which leads to memory corruption when a malicious file is opened by the user. This memory corruption can be exploited by an attacker to execute arbitrary code within the context of the current process, potentially allowing them to manipulate the system or software behavior. The vulnerability requires the attacker to have local access and for the user to open a crafted malicious file, but it does not require any authentication or elevated privileges. The CVSS 4.0 vector indicates an attack vector of local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:A), and partial impacts on confidentiality, integrity, and high impact on availability. There are no known exploits in the wild, and no patches have been released as of the publication date. DIAScreen is used in industrial automation and control environments, making this vulnerability particularly relevant for operational technology (OT) environments. The lack of proper input validation is a common and critical security flaw that can lead to serious consequences if exploited, including unauthorized code execution and potential disruption of industrial processes.

For European organizations, especially those involved in industrial automation, manufacturing, and critical infrastructure, this vulnerability poses a risk of unauthorized code execution that could disrupt operations or lead to data compromise. Exploitation could allow attackers to manipulate or disable industrial control systems, causing operational downtime or safety hazards. The partial impact on confidentiality and integrity means sensitive operational data could be exposed or altered, while the high impact on availability could lead to service interruptions. Since the attack requires user interaction and local access, the threat is more significant in environments where users handle files from external or untrusted sources. The absence of known exploits currently reduces immediate risk, but the vulnerability's presence in critical OT software necessitates prompt attention to prevent future exploitation. European industries with extensive use of Delta Electronics products, particularly in Germany, France, Italy, and the UK, could face higher exposure due to their large industrial bases and reliance on automation technologies.

1. Restrict file sources by implementing strict policies on file origins and types allowed to be opened within DIAScreen. 2. Employ application whitelisting and sandboxing to limit the execution context of DIAScreen and prevent arbitrary code execution. 3. Educate users to avoid opening files from untrusted or unknown sources, emphasizing the risk of malicious files. 4. Monitor and log file access and application behavior to detect anomalies indicative of exploitation attempts. 5. Isolate critical industrial control systems from general IT networks to reduce attack surface and limit local access opportunities. 6. Coordinate with Delta Electronics for timely patch deployment once available and apply security updates promptly. 7. Conduct regular security assessments and penetration testing focused on file handling and input validation within DIAScreen environments. 8. Implement network segmentation and strict access controls to minimize the risk of lateral movement if exploitation occurs.