CVE-2025-40827 Overview
CVE-2025-40827 is a DLL hijacking vulnerability affecting Siemens Software Center and Solid Edge SE2025. The flaw stems from insecure library loading behavior classified under [CWE-427] Uncontrolled Search Path Element. An attacker who can place a crafted Dynamic Link Library (DLL) on the target system can trick the affected application into loading it, resulting in arbitrary code execution in the context of the user running the application. The vulnerability impacts Siemens Software Center versions prior to V3.5 and Solid Edge SE2025 versions prior to V225.0 Update 10.
Critical Impact
Successful exploitation allows local arbitrary code execution with the privileges of the targeted user, compromising confidentiality, integrity, and availability of the host.
Affected Products
- Siemens Software Center, all versions prior to V3.5
- Siemens Solid Edge SE2025, all versions prior to V225.0 Update 10
- Windows endpoints where these engineering applications are installed
Discovery Timeline
- 2025-11-11 - CVE-2025-40827 published to the National Vulnerability Database (NVD)
- 2026-04-15 - Last updated in the NVD database
Technical Details for CVE-2025-40827
Vulnerability Analysis
The affected Siemens applications fail to enforce a secure DLL search order when loading dependent libraries at runtime. When the application starts, Windows searches a sequence of directories for required DLLs. If a writable directory appears in the search path before the legitimate library location, an attacker-controlled DLL placed there will be loaded into the process. The library then executes in the security context of the application, granting the attacker code execution on the system. The flaw requires user interaction, typically the user launching the vulnerable application after the malicious DLL has been planted.
Root Cause
The root cause is an uncontrolled search path element [CWE-427]. The application does not specify fully qualified paths for library dependencies and does not call hardening APIs such as SetDefaultDllDirectories or SetDllDirectory to restrict the search order. As a result, directories writable by standard users, including the application's working directory, are consulted before trusted system locations.
Attack Vector
The vector is local. An attacker first needs the ability to write a crafted DLL to a directory included in the application's DLL search path. This can be achieved through prior low-privilege access, a malicious archive that drops both an executable and a sibling DLL, or a shared network location. When the user launches Siemens Software Center or Solid Edge SE2025, the rogue DLL loads and executes arbitrary code. See the Siemens Security Advisory SSA-365596 for vendor technical details.
Detection Methods for CVE-2025-40827
Indicators of Compromise
- Unexpected DLL files present in installation directories or working folders of Siemens Software Center or Solid Edge SE2025
- Unsigned or non-Siemens-signed DLLs loaded by Siemens application processes
- Child processes spawned from Siemens application binaries that are inconsistent with normal engineering workflows
Detection Strategies
- Monitor image-load events (Sysmon Event ID 7) for Siemens application processes loading DLLs from non-standard or user-writable paths
- Alert on DLL writes by low-privileged processes into directories adjacent to Siemens executables
- Hunt for code-signing anomalies where modules loaded by Siemens binaries lack a valid Siemens digital signature
Monitoring Recommendations
- Enable Sysmon with a configuration that logs ImageLoad and FileCreate events for engineering software directories
- Centralize endpoint telemetry in a SIEM or data lake to correlate DLL writes with subsequent application launches
- Track command-line activity for Siemens processes to identify post-exploitation behaviors such as scripting host or LOLBin execution
How to Mitigate CVE-2025-40827
Immediate Actions Required
- Upgrade Siemens Software Center to V3.5 or later
- Upgrade Solid Edge SE2025 to V225.0 Update 10 or later
- Audit endpoints running these products to identify untrusted DLLs in their working directories
- Restrict write permissions on directories containing Siemens application binaries to administrators only
Patch Information
Siemens has released fixed versions addressing CVE-2025-40827. Apply Siemens Software Center V3.5 and Solid Edge SE2025 V225.0 Update 10 as documented in Siemens Security Advisory SSA-365596. Validate installations after patching to confirm the new version metadata.
Workarounds
- Launch the affected applications only from trusted, access-controlled directories that standard users cannot modify
- Avoid opening Siemens project files or installers delivered from untrusted sources such as email attachments or shared archives
- Enforce application allowlisting policies that block execution of unsigned DLLs from user-writable paths
- Apply least-privilege principles so engineering users do not run with administrative rights
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
