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Telecontrol Server BasicApplication · Siemens

CVE-2025-32835

HIGH · 8.8 CVSS v3.1 Published 2025-04-16
Fix available
A fix is available. Upgrade to 3.1.2.2 or later.
See remediation →
94/100
Remediation priority · Urgent
Remotely reachable Zero-click

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 · unedited
A 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 'UpdateConnectionVariableArchivingBuffering' method. This could allow an authenticated 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.

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 confidence

SQL injection vulnerability in TeleControl Server Basic's UpdateConnectionVariableArchivingBuffering method allows authenticated remote attackers to read/write database contents and execute code with NT AUTHORITY\NetworkService privileges by exploiting unsanitized input through an internal method.

MitigationUpgrade to TeleControl Server Basic V3.1.2.2 or later to patch the SQL injection vulnerability, and restrict access to port 8000 to minimize attack surface until the patch is applied.

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
Telecontrol Server BasicApplication
Affected:< 3.1.2.2

CVSS 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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/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 checks

Work through these to decide whether this CVE applies to you.

  1. Identify TeleControl Server Basic installation
    Locate the TeleControl Server Basic installation directory or check Windows Programs and Features for 'Siemens Telecontrol Server Basic' entry
    Affected if The installed version is shown as anything below 3.1.2.2 (e.g., 3.1.1.0, 3.0.x, etc.)
  2. Determine the exact installed version
    Open the product's About dialog, check the version in the installation folder's versioninfo file, or query the Windows Registry under HKLM\SOFTWARE\Siemens\TeleControlServerBasic for the Version value
    Affected if The version string is lower than 3.1.2.2 (e.g., begins with 3.1.1, 3.0, or any version without the '.2.2' suffix in the third octet)
  3. Verify if the UpdateConnectionVariableArchivingBuffering feature is exposed
    Check if the TeleControl Server Basic web service or API endpoint handling this method is accessible by reviewing the server configuration or attempting a local request to the service on port 8000
    Affected if The service is running and the UpdateConnectionVariableArchivingBuffering method is enabled and reachable over the network
  4. Confirm network exposure of port 8000
    Run 'netstat -an | findstr :8000' or check Windows Firewall rules to see if port 8000 is listening on external interfaces (0.0.0.0) rather than localhost only (127.0.0.1)
    Affected if Port 8000 is bound to 0.0.0.0 or a non-loopback IP address, making the vulnerable service network-accessible

You are affected if TeleControl Server Basic is installed with a version lower than 3.1.2.2 AND the service is network-accessible on port 8000, allowing unauthenticated or weakly-authenticated attackers to reach the UpdateConnectionVariableArchivingBuffering method.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 3.1.2.2 or later
Fixed in 3.1.2.2
Interim mitigation

Upgrade to TeleControl Server Basic V3.1.2.2 or later to patch the SQL injection vulnerability, and restrict access to port 8000 to minimize attack surface until the patch is applied.

Recommended fix High confidence

V3.1.2.2

  1. 1. Identify all systems running TeleControl Server Basic
  2. 2. Check current version of TeleControl Server Basic on each system
  3. 3. If version is below V3.1.2.2, download the V3.1.2.2 or later version from the official Siemens portal (cert-portal.siemens.com)
  4. 4. Before upgrading, backup the current installation and database
  5. 5. Apply the upgrade to V3.1.2.2 or latest available version
  6. 6. Verify the upgrade was successful by checking the version number
  7. 7. Confirm the application is functioning correctly
  8. 8. Restrict access to port 8000 to only authorized personnel as an additional defense-in-depth measure
Caveat Review release notes for V3.1.2.2 for any configuration or compatibility changes before upgrading

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Telecontrol Server Basic Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-32835 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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