Siemens SINEC OS Exposure of Sensitive Information to an Unauthorized Actor (CVE-2025-40803)

low Tenable OT Security Plugin ID 503749

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The affected device exposes certain non-critical information from the device. This could allow an unauthenticated attacker to access sensitive data, potentially leading to a breach of confidentiality.

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Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

Siemens has identified the following specific workarounds and mitigations users can apply to reduce risk:

- RUGGEDCOM RST2428P (6GK6242-6PA00): Create a firewall rule that blocks the UDP ports if not required. The device uses UDP 34964 and one port in range 49152-65535 for discovery protocols like LLDP, DCP, MRP etc.

As a general security measure, Siemens recommends protecting network access to devices with appropriate mechanisms. To operate the devices in a protected IT environment, Siemens recommends configuring the environment according to Siemens' operational guidelines for industrial security and following recommendations in the product manuals.

Additional information on industrial security by Siemens can be found on the Siemens industrial security webpage

For more information see the associated Siemens security advisory SSA-494539 in HTML and CSAF.

Plugin Details

Severity: Low

ID: 503749

File Name: tenable_ot_siemens_CVE-2025-40803.nasl

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 10/27/2025

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v3

Risk Factor: Low

Base Score: 3.1

Vector: CVSS:3.0/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Vulnerability Information

CPE: cpe:/o:siemens:ruggedcom_rst2428p_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 9/9/2025

Vulnerability Publication Date: 9/9/2025

Reference Information

CVE: CVE-2025-40803

CWE: 200

Detections

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