CVE-2025-40809 is an out-of-bounds write vulnerability classified under CWE-787, affecting Siemens Solid Edge SE2024 and SE2025 CAD software versions prior to V224.0 Update 14 and V225.0 Update 6. The vulnerability arises when the software parses specially crafted PRT files, which are proprietary part files used within Solid Edge. An attacker can exploit this flaw by supplying a malicious PRT file that triggers an out-of-bounds write operation, corrupting memory. This memory corruption can lead to application crashes (denial of service) or, more critically, arbitrary code execution within the context of the Solid Edge process. The CVSS 3.1 base score is 7.8, reflecting high severity due to the potential for full compromise of the affected application’s process. The attack vector is local (AV:L), requiring the attacker to have local access or to convince a user to open a malicious file (UI:R). No privileges are required (PR:N), but user interaction is necessary. The vulnerability impacts confidentiality, integrity, and availability, as arbitrary code execution could allow data theft, manipulation, or disruption of CAD workflows. Siemens has not yet released patches at the time of this report, and no known exploits have been observed in the wild. The vulnerability is particularly concerning for organizations relying on Solid Edge for critical design and manufacturing processes, as exploitation could disrupt operations or lead to intellectual property theft.

For European organizations, especially those in manufacturing, automotive, aerospace, and engineering sectors that heavily use Siemens Solid Edge software, this vulnerability poses a significant risk. Successful exploitation could lead to unauthorized code execution, enabling attackers to steal sensitive design data, manipulate CAD models, or disrupt production workflows. This could result in intellectual property loss, operational downtime, and financial damage. The requirement for user interaction means phishing or social engineering could be used to deliver malicious PRT files. Given the critical role of CAD software in product development and manufacturing, any compromise could have cascading effects on supply chains and product integrity. Additionally, disruption of design processes could delay projects and impact competitiveness. The vulnerability’s local attack vector limits remote exploitation but does not eliminate risk in environments where file sharing or removable media are common. European organizations must consider the potential for insider threats or compromised endpoints as vectors for attack.

1. Monitor Siemens communications closely and apply official patches or updates for Solid Edge SE2024 and SE2025 as soon as they become available. 2. Implement strict controls on the handling and opening of PRT files, especially those received from untrusted or external sources. 3. Educate users about the risks of opening unsolicited or suspicious CAD files and enforce policies to verify file origins. 4. Use endpoint protection solutions capable of detecting anomalous behavior or exploitation attempts related to memory corruption. 5. Employ application whitelisting and sandboxing techniques to limit the impact of potential exploitation. 6. Restrict local access to systems running Solid Edge to trusted personnel only and enforce least privilege principles. 7. Regularly back up critical design data and maintain incident response plans tailored to CAD software compromise scenarios. 8. Consider network segmentation to isolate engineering workstations from broader corporate networks to reduce lateral movement risk.