CVE-2025-27127 in TIA Project-Server
Summary
by MITRE • 07/08/2025
A vulnerability has been identified in TIA Project-Server (All versions < V2.1.1), TIA Project-Server V17 (All versions), Totally Integrated Automation Portal (TIA Portal) V17 (All versions), Totally Integrated Automation Portal (TIA Portal) V18 (All versions), Totally Integrated Automation Portal (TIA Portal) V19 (All versions), Totally Integrated Automation Portal (TIA Portal) V20 (All versions < V20 Update 3). The affected application improperly handles uploaded projects in the document root. This could allow an attacker with contributor privileges to cause denial of service by uploading a malicious project.
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Analysis
by VulDB Data Team • 08/12/2025
This vulnerability exists within Siemens TIA Portal and TIA Project-Server software across multiple versions, representing a critical security flaw that could be exploited to disrupt system operations. The issue stems from improper handling of uploaded projects within the document root directory, creating a pathway for malicious actors to manipulate the system's normal operation. The vulnerability specifically affects versions prior to V2.1.1 for TIA Project-Server and various versions of TIA Portal V17 through V20, indicating a widespread impact across Siemens' industrial automation platforms. The flaw allows attackers with contributor-level privileges to upload malicious project files that can trigger denial of service conditions, effectively disrupting normal operational procedures.
The technical nature of this vulnerability aligns with CWE-434, which describes insecure file upload handling, and represents a classic example of insufficient input validation and improper resource management. When malicious project files are uploaded to the document root, they can cause the system to consume excessive resources or enter unstable states that prevent normal operation. This behavior demonstrates how improper validation of user-supplied content can lead to resource exhaustion and system instability. The vulnerability operates at the application layer where project files are processed, creating an attack surface that allows unauthorized users to manipulate system resources through seemingly legitimate upload functionality.
The operational impact of this vulnerability extends beyond simple denial of service, as it affects critical industrial automation environments where system reliability is paramount. In industrial control systems, such disruptions can lead to production halts, safety system degradation, or even cascading failures that affect broader operational networks. The vulnerability's exploitation requires only contributor privileges, which are often more accessible in collaborative environments where multiple users need to contribute to project development. This low privilege requirement makes the vulnerability particularly dangerous as it can be exploited by insiders or compromised accounts with relatively limited access rights.
Mitigation strategies should focus on implementing strict file validation and sanitization procedures for all uploaded content, including comprehensive file type checking and size limitations. Organizations should enforce principle of least privilege controls to limit contributor access to only necessary functions and implement network segmentation to isolate critical automation systems. Regular security updates and patches should be deployed immediately upon availability, with particular attention to the specific version ranges mentioned in the vulnerability description. The implementation of web application firewalls and intrusion detection systems can provide additional monitoring and protection against malicious upload attempts. Security awareness training for users should emphasize the risks of uploading untrusted files and the importance of maintaining secure development practices within automation environments.