CVE-2025-27540
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 'Authenticate' 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-25913)
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 vulnerability in TeleControl Server Basic's Authenticate method allows unauthenticated remote attackers to bypass authorization, read/write to the database, and execute code with NT AUTHORITY\NetworkService privileges. Exploitation requires network access to 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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Confirm TeleControl Server Basic installationIdentify if Siemens TeleControl Server Basic is installed on the target system. Check installed programs, services, or product-specific directories.Affected if The product is not installed, the system is not affected by this CVE.
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Check installed versionLocate and read the installed version of TeleControl Server Basic. Compare the version number against the affected range: versions lower than 3.1.2.2 are vulnerable.Affected if Installed version is below 3.1.2.2, the system falls within the affected version range.
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Verify port 8000 accessibilityDetermine if port 8000 is open and listening on the system. Use network scanning tools or check listening ports locally. This is the port where the vulnerable Authenticate method is exposed.Affected if Port 8000 is exposed to the network, exploitation is possible.
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Confirm Authenticate method exposureVerify that the Authenticate method is reachable over the network on port 8000. This is the specific endpoint containing the SQL injection vulnerability.Affected if The Authenticate method is network-accessible, the SQL injection attack surface is present.
System is affected if TeleControl Server Basic is installed with version below 3.1.2.2 and port 8000 is network-accessible, allowing remote attackers to reach the vulnerable Authenticate method.
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 TeleControl Server Basic V3.1.2.2 or later to remediate this critical SQL injection vulnerability. Restrict network access to port 8000 as an interim measure if immediate upgrade is not feasible.
V3.1.2.2
- Obtain TeleControl Server Basic version 3.1.2.2 from the official Siemens download portal or through your Siemens support channel
- Ensure port 8000 is accessible for the upgrade process
- Backup the current TeleControl Server Basic configuration and database before proceeding
- Install version 3.1.2.2 following standard Siemens installation procedures
- Verify the installation completed successfully
- Confirm the application is running on the new version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation4.0 h
- Testing3.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-27540 — 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-2025-27540 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
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