CVE-2025-27539
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 < V3.1.2.2). The affected application is vulnerable to SQL injection through the internally used 'VerifyUser' method. This could allow an unauthenticated remote attacker to bypass authorization controls, to read from and write to the application's database and execute code with "NT AUTHORITY\NetworkService" permissions. A successful attack requires the attacker to be able to access port 8000 on a system where a vulnerable version of the affected application is executed on. (ZDI-CAN-25914)
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 · high confidenceSQL injection in TeleControl Server Basic's VerifyUser method allows unauthenticated remote attackers to bypass authentication, read/write to the database, and execute code with NT AUTHORITY\NetworkService privileges via port 8000.
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< 3.1.2.2CVSS 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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 installationLocate TeleControl Server Basic installation directory or check Windows services for 'TeleControl Server Basic' service using services.msc or 'sc query' commandAffected if The software is installed on the system
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Verify installed versionCheck the version of TeleControl Server Basic by reviewing installation files, registry keys, or the application's About/Version informationAffected if The installed version is lower than 3.1.2.2
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Confirm vulnerable service is runningCheck if TeleControl Server Basic service is running using 'sc query' or Task Manager, and verify it is listening on port 8000 using 'netstat -an | findstr :8000'Affected if The service is running and listening on port 8000 (TCP)
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Check network exposure of port 8000Review firewall rules or perform a port scan to determine if port 8000 is accessible from untrusted networksAffected if Port 8000 is exposed to untrusted or external network access
The system is affected if TeleControl Server Basic is installed with a version lower than 3.1.2.2 and the service is running with port 8000 accessible, allowing unauthenticated remote SQL injection attacks.
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 · scoped3.1.2.2
Upgrade to version V3.1.2.2 or later; if patching is delayed, restrict network access to port 8000 and deploy WAF rules to block SQL injection patterns.
Telecontrol Server Basic V3.1.2.2
- Obtain Telecontrol Server Basic version 3.1.2.2 or later from the official Siemens download portal or through your existing support channels
- Create a complete backup of the current configuration and database
- Stop the Telecontrol Server Basic service
- Install the updated version (3.1.2.2 or later) following Siemens installation documentation
- Start the Telecontrol Server Basic service
- Verify the application is running correctly and the service is accessible on port 8000
- Confirm the SQL injection vulnerability is remediated by reviewing that the VerifyUser method no longer accepts unsanitized input
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation6.0 h
- Implementation10.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27539 — 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-2025-27539 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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- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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