Siemens has released patches for a high-severity DLL hijacking vulnerability in Solid Edge SE2025 and Siemens Software Center that could allow an attacker to take full control of an engineering workstation simply by tricking a user into opening a file from a compromised location. The flaw, tracked as CVE-2025-40827, carries a CVSS v3.1 base score of 7.8 and a CVSS v4 base score of 8.5, and was detailed in a CISA advisory on November 13, 2025. If you use either application in a design, manufacturing, or industrial environment, applying the updates should be treated as an immediate priority.

What Actually Changed

On November 13, 2025, the U.S. Cybersecurity and Infrastructure Security Agency (CISA) published advisory ICSA-25-317-17, detailing a vulnerability in Siemens Software Center (all versions prior to 3.5) and Solid Edge SE2025 (all versions prior to V225.0 Update 10). The underlying issue is an uncontrolled search path element—commonly known as DLL hijacking—that lets an attacker execute arbitrary code when a crafted DLL is placed in a location from which the application loads libraries.

The vulnerability was reported by researcher Sahil Shah from National Forensic Sciences University. Siemens published its own advisory (SSA-365596) with remediation guidance, and fixed versions are now available:

  • Siemens Software Center: upgrade to version 3.5 or later
  • Solid Edge SE2025: upgrade to V225.0 Update 10 or later

Both patches remove the unsafe DLL search behavior that allowed the hijack. Siemens ProductCERT is the authoritative source for updates and any follow-on advisories; CISA’s republication serves as an initial alert and will not be updated further.

What It Means for You

If your organization uses Solid Edge for 3D CAD design or Siemens Software Center to manage engineering tools, this vulnerability poses a real threat. The attack requires an attacker to place a malicious DLL file on a system or a shared network location and then convince a user to launch the affected application—something that can easily happen through phishing emails, compromised file shares, or even supply chain interactions. Once the application loads the bogus DLL, the attacker gains code execution with the same privileges as the user running the software. On many engineering workstations, those privileges are often elevated, making lateral movement and access to sensitive design data or operational technology networks a real possibility.

For designers and engineers: Be extremely cautious opening project files, installers, or plugins from untrusted sources. An innocent-looking ZIP file that contains a DLL placed in the same folder as a Solid Edge project could compromise your machine when you double-click the project.

For IT and security admins: This is a classic but dangerous attack vector that is often underestimated in engineering environments. Patching is the definitive fix, but until you roll out updates, you must implement containment measures such as blocking executables from user-writable folders, restricting file access on shared drives, and enforcing least-privilege accounts for CAD users.

For management: The risk extends beyond the workstation. A compromised CAD machine can become a pivot point into protected industrial control systems. Immediate inventory and patching, combined with supply chain hygiene, are critical.

How We Got Here

DLL hijacking has been a well-known Windows attack technique for decades. It exploits the way applications load dynamic-link libraries—often searching the current working directory or other user-accessible locations before checking trusted system paths. If an attacker can drop a malicious DLL with the same name as a legitimate dependency into one of those directories, the application will load it without question.

In the case of Solid Edge and Software Center, Siemens confirmed that the applications do not adequately control the DLL search order, leaving them open to this classic hijack. While the vulnerability cannot be exploited remotely (an attacker must already have some form of local access, whether physical or through file placement), the complexity is rated low: a single crafted DLL is enough. The impact, however, is high—total compromise of confidentiality, integrity, and availability.

Siemens software is heavily used in critical manufacturing, aerospace, automotive, and infrastructure projects. The exposure is therefore not limited to office IT; many installations sit on networks that are adjacent to production systems. The researcher who identified the flaw, Sahil Shah, has been credited by both Siemens and CISA, highlighting the importance of vulnerability research in operational technology environments.

What to Do Now

1. Patch Immediately (within days)

  • For Siemens Software Center: verify the current version. If it is below 3.5, download and install version 3.5 or later from Siemens’ official channels.
  • For Solid Edge SE2025: check the installed build. If it is earlier than V225.0 Update 10, apply Update 10 or a later cumulative update.

Always validate the build number after patching and confirm that the vulnerability is remediated by checking the product’s version information against Siemens’ advisory SSA-365596.

2. Inventory and Contain (within hours)

  • Identify all Windows systems running the affected software. A quick PowerShell script or your endpoint management tool can audit installed applications.
  • Locate network shares, temporary folders, and email gateways that handle Solid Edge project files (PRT, PRJ) or software packages.
  • Block or quarantine inbound attachments that contain DLLs in compressed archives from untrusted senders.
  • Enforce group policies that prevent users from launching applications from temporary or download folders.

3. Reduce Attack Surface (ongoing)

  • Run Solid Edge and Software Center under standard user accounts, not with local administrator privileges.
  • Implement application allowlisting (e.g., AppLocker, Windows Defender Application Control) to restrict what can execute on engineering workstations.
  • If your organization exchanges CAD files with external partners, consider setting up isolated “jump boxes” or virtual machines where third-party files are opened and sanitized before entering the production network.

4. Harden Windows Against DLL Hijacking

Microsoft provides defensive features that can lower the risk even before patching, though the vendor fix is the only reliable way to address this specific CVE.

  • Verify Safe DLL Search Mode is enabled. On modern Windows systems it’s on by default (registry key HKLM\System\CurrentControlSet\Control\Session Manager\SafeDllSearchMode should be 1). This changes the search order to check system directories first.
  • For developers and integrators: when building automation that interacts with Siemens tools, use fully qualified paths in LoadLibrary calls and leverage SetDefaultDllDirectories with the LOAD_LIBRARY_SEARCH_DEFAULT_DIRS flag to eliminate unsafe search locations.

5. Monitor for Signs of Exploitation

  • Alert on any new DLL files appearing in application folders or user‑writable paths that match the names of legitimate Siemens DLLs.
  • Watch for abnormal child processes spawned by SolidEdge.exe or SiemensSoftwareCenter.exe, especially unexpected network connections.
  • Investigate repeated application crashes—many exploit attempts cause a crash before achieving code execution.
  • Preserve forensic evidence (memory dumps, triggering files, event logs) if you suspect compromise.

No public exploitation of CVE-2025-40827 has been reported as of the advisory’s publication, but that can change quickly once details are widely circulated. Treat this as a race to patch rather than a reason to delay.

Outlook

Siemens products are deeply embedded in the workflows of manufacturers and engineers worldwide, and a classic DLL hijack like this one reminds us that even mature software can carry dangerous, long-lived weaknesses. The immediate path forward is clear: patch Software Center and Solid Edge SE2025, harden the Windows systems on which they run, and prepare your security operations to detect similar attacks. Keeping an eye on Siemens ProductCERT for any updated guidance or additional patches will help you stay ahead of the next threat.

For now, the single most important action is to locate every installation of the affected software in your environment and bring it up to a fixed version. The risk is high, the exploit is simple, and the fix is already here.