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Siemens TeleControl Server Basic V3.1.2.2 Password Hash Disclosure

Critical

Synopsis

An information disclosure vulnerability exists in the Database Service in Siemens TeleControl Server Basic (TCSB) V3.1.2.2. An unauthenticated, remote attacker can exploit it to obtain password hashes of TCSB users, allowing the attacker to login to and perform authenticated operations of the database service listening on default TCP port 8000.

 

Once the password hash of a TCBS user is obtained, the attacker can login to TCBS database service by calling the Authenticate operation, which uses the password hash of a user to authenticate the user.  

 

Once authenticated, the attacker can invoke other operations of the IDatabaseServices. For example, the attacker can invoke the UpdateUsers operation to add an administrative TCBS user.

Solution

Upgrade to version V3.1.2.3 or later.

Disclosure Timeline

July 23, 2025: Tenable sends disclosure email.
July 24, 2025: Siemens confirms receipt.
August 11, 2025: Tenable asks Siemens for a status update.
August 12, 2025: Siemens responds that they are working on a fix which they plan to have published by early October.
September 8, 2025: Tenable asks Siemens for a status update.
September 8, 2025: Siemens responds that they are still on track to publish in October.
October 2, 2025: Tenable asks for a status update.
October 7, 2025: Siemens responds that they are on track to publish on Tuesday October 14.
October 14, 2025: Siemens notifies Tenable that they have published their advisory.

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Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2025-40765
Tenable Advisory ID: TRA-2025-46
CVSSv3 Base / Temporal Score:
9.8
CVSSv3 Vector:
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSSv4 Base Score:
9.3
CVSSv4 Vector:
AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected Products:
TeleControl Server Basic
Risk Factor:
Critical

Advisory Timeline

October 14, 2025 - Initial release.
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