Siemens TeleControl Server Basic 3.1.2.1 VerifyUser sql injection

Summaryinfo

A vulnerability described as critical has been identified in Siemens TeleControl Server Basic. The impacted element is the function VerifyUser. The manipulation results in sql injection. This vulnerability was named CVE-2025-27539. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Siemens TeleControl Server Basic. It has been classified as critical. Affected is the function VerifyUser. The manipulation with an unknown input leads to a sql injection vulnerability. CWE is classifying the issue as CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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 '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)

The advisory is shared for download at cert-portal.siemens.com. This vulnerability is traded as CVE-2025-27539 since 02/28/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/19/2025). The MITRE ATT&CK project declares the attack technique as T1505.

Upgrading to version 3.1.2.2 eliminates this vulnerability.

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Productinfo

Vendor

• Siemens

Name

• TeleControl Server Basic

Version

• 3.1.2.1

License

• commercial

Website

• Vendor: https://www.siemens.com/

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