CVE-2025-40942
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability has been identified in TeleControl Server Basic (All versions < V3.1.2.4). Affected application contains a local privilege escalation vulnerability that could allow an attacker to run arbitrary code with elevated privileges.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA local privilege escalation vulnerability in TeleControl Server Basic versions prior to V3.1.2.4 allows an authenticated local attacker to execute arbitrary code with SYSTEM-level privileges. The vulnerability stems from improper privilege management within the application, enabling a standard user to escalate to elevated privileges.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 3.1.2.4CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify TeleControl Server Basic installationLook for TeleControl Server Basic in the system registry under HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall or check common installation paths such as C:\Program Files\Siemens\ or C:\Siemens\Affected if The application is installed on the system
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Determine installed versionLocate the TeleControl Server Basic executable (often named TCServer.exe or similar) and check its file version properties, or query the Windows registry for the installed version stringAffected if The reported version is lower than 3.1.2.4 or the version cannot be determined (older installation)
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Verify service statusCheck if the TeleControl Server Basic Windows service is running using 'sc query TCServer' or through Services.mscAffected if The service is currently running and accepts local user authentication
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Check user context of serviceRun 'sc qc TCServer' to view the service configuration and verify under which account the service executesAffected if The service runs under a privileged account (such as SYSTEM, LocalSystem, or an administrator-level account)
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Assess local user accessUse 'net user' or Local Users and Groups (lusrmgr.msc) to enumerate local users on the systemAffected if Standard non-privileged local users exist who could potentially authenticate to TeleControl Server Basic and exploit the privilege escalation
A system is affected if TeleControl Server Basic is installed with a version prior to 3.1.2.4, the service runs under elevated privileges, and standard local users can authenticate to the application.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped3.1.2.4
Upgrade TeleControl Server Basic to version V3.1.2.4 or later to remediate this vulnerability.
V3.1.2.4
- Obtain the fixed version V3.1.2.4 from the official Siemens download portal or through your Siemens support channel
- Review the Siemens product documentation and release notes for V3.1.2.4 before initiating the upgrade
- Ensure you have a complete backup of the TeleControl Server Basic configuration and data
- Schedule a maintenance window as the upgrade may require service restart
- Stop the TeleControl Server Basic service before applying the upgrade
- Install version 3.1.2.4 following the Siemens installation guide for your deployment type (standalone or distributed)
- After installation, verify the service starts successfully
- Validate that all expected functionality is operating normally
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-40942 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-40942 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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