CVE-2025-32828: Siemens Telecontrol Server Basic SQLI

CVE-2025-32828 Overview

CVE-2025-32828 is a SQL injection vulnerability [CWE-89] affecting Siemens TeleControl Server Basic versions prior to V3.1.2.2. The flaw resides in the internally used UpdateProjectCrossCommunications method, which fails to properly sanitize input passed to database queries. An authenticated remote attacker with network access to port 8000 can exploit this weakness to bypass authorization controls, read and modify database contents, and execute code with NT AUTHORITY\NetworkService privileges. The vulnerability affects industrial control system (ICS) environments where TeleControl Server Basic manages remote terminal units and SCADA telecontrol communications.

Critical Impact
Authenticated attackers reachable on port 8000 can execute arbitrary code as NT AUTHORITY\NetworkService and gain full read/write access to the application database.

Affected Products

Siemens TeleControl Server Basic — all versions before V3.1.2.2
Deployments exposing TCP port 8000 to untrusted networks
Industrial and utility environments using TeleControl Server Basic for SCADA/RTU management

Discovery Timeline

2025-04-16 - CVE-2025-32828 published to NVD
2025-04-16 - Siemens releases advisory SSA-443402
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-32828

Vulnerability Analysis

The vulnerability is a classic SQL injection [CWE-89] within an internal server method named UpdateProjectCrossCommunications. This method is reachable through the application's network service on port 8000 after authentication. Because user-controllable parameters are concatenated directly into SQL statements, attackers can inject arbitrary SQL fragments that the database engine executes with the privileges of the application service account.

Successful exploitation produces three distinct outcomes. First, the attacker bypasses authorization controls that would otherwise restrict data access. Second, arbitrary read and write operations against the underlying database become possible. Third, the attacker can escalate to command execution under the NT AUTHORITY\NetworkService account, providing a pivot point into the operational technology (OT) environment.

Root Cause

The root cause is insufficient input validation and the absence of parameterized queries within the UpdateProjectCrossCommunications method. User-supplied values reach the SQL query layer without proper sanitization or prepared statement binding, allowing SQL metacharacters to alter query semantics.

Attack Vector

Exploitation requires network reachability to TCP port 8000 on the affected server and valid authentication credentials to the application. The attacker submits a crafted request that invokes the UpdateProjectCrossCommunications method with malicious SQL payloads embedded in expected parameters. The injected SQL executes within the SQL Server context, enabling data exfiltration, tampering, and stacked queries that invoke command execution primitives such as xp_cmdshell. Detailed exploitation mechanics are described in the Siemens Security Advisory SSA-443402.

Detection Methods for CVE-2025-32828

Indicators of Compromise

Unexpected process creation by the TeleControl Server Basic service under the NT AUTHORITY\NetworkService account, particularly cmd.exe, powershell.exe, or sqlservr.exe child processes.
Anomalous SQL statements in database logs containing UNION, stacked queries, or references to system stored procedures like xp_cmdshell originating from the application service.
Inbound TCP sessions to port 8000 from IP addresses outside the expected management network.
New or modified rows in TeleControl Server Basic project tables that do not correspond to authorized engineering activity.

Detection Strategies

Enable SQL Server auditing on the TeleControl database and alert on xp_cmdshell invocations, schema changes, and error patterns indicative of injection attempts.
Deploy network intrusion detection signatures for SQL injection payloads targeting port 8000 of TeleControl Server Basic hosts.
Correlate authentication events with subsequent database write activity to surface abuse of legitimate accounts.

Monitoring Recommendations

Baseline normal traffic patterns on port 8000 and alert on volume or source deviations.
Monitor the NetworkService account for child process creation and outbound network connections, which are unusual for this service context.
Forward Windows Security, SQL Server, and TeleControl application logs to a centralized SIEM for correlation and long-term retention.

How to Mitigate CVE-2025-32828

Immediate Actions Required

Upgrade Siemens TeleControl Server Basic to version V3.1.2.2 or later, as directed by Siemens Security Advisory SSA-443402.
Restrict access to TCP port 8000 using host-based firewalls and network segmentation so that only authorized engineering workstations can reach the service.
Review and rotate credentials for all TeleControl Server Basic accounts, and audit account activity for signs of prior misuse.
Enforce least-privilege principles on the SQL Server instance backing TeleControl Server Basic and disable xp_cmdshell if it is not required.

Patch Information

Siemens fixed the vulnerability in TeleControl Server Basic V3.1.2.2. Administrators should apply the update following the guidance in the Siemens Security Advisory SSA-443402. No alternative vendor patch is available for earlier versions.

Workarounds

Limit port 8000 exposure to a dedicated management VLAN and block it at perimeter and OT/IT boundary firewalls.
Place TeleControl Server Basic behind a VPN or jump host requiring multi-factor authentication for administrative access.
Apply Siemens' general operational guidelines for industrial security, including defense-in-depth and cell protection concepts referenced in the vendor advisory.

bash

# Example Windows firewall rule restricting port 8000 to a management subnet
netsh advfirewall firewall add rule name="TeleControl 8000 Restrict" \
  dir=in action=allow protocol=TCP localport=8000 \
  remoteip=10.10.20.0/24

netsh advfirewall firewall add rule name="TeleControl 8000 Block Other" \
  dir=in action=block protocol=TCP localport=8000