Siemens SIPROTEC 5 Use of Get Request Method with Sensitive Query Strings (CVE-2025-40742)

medium Tenable OT Security Plugin ID 504806

Synopsis

The remote OT asset is affected by a vulnerability.

Description

The affected devices include session identifiers in URL requests for certain functionalities. This could allow an attacker to retrieve sensitive session data from browser history, logs, or other storage mechanisms, potentially leading to unauthorized access.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

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

Siemens is preparing fixed versions and recommends countermeasures for products where fixes are unavailable or not yet available.

Operators of critical power systems (e.g., TSOs or DSOs) worldwide are typically required by regulations to build resilience into the power grids by applying multi-level redundant secondary protection schemes. Therefore, operators should check whether appropriate resilient protection measures are in place. The risk of cyber incidents affecting the grid's reliability can thus be minimized by the grid design. Siemens strongly recommends applying the provided security updates using the corresponding tools and documented procedures that accompany the product. If the product supports this capability, an automated method can be used to apply the security updates across multiple product instances. Siemens strongly recommends validating any security update before it is applied and ensuring that trained staff supervise the update process in the target environment. As a general security measure, Siemens strongly recommends protecting network access with appropriate security mechanisms (e.g., firewalls, segmentation, VPN). It is advised that the environment be configured according to Siemens' operational guidelines to operate the devices in a protected IT environment.

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-904646 in HTML and CSAF.

Plugin Details

Severity: Medium

ID: 504806

File Name: tenable_ot_siemens_CVE-2025-40742.nasl

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 11/18/2025

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v3

Risk Factor: Medium

Base Score: 5.3

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

Vulnerability Information

CPE: cpe:/o:siemens:siprotec_5_7sa86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ve85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sk82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sk85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_compact_7sx800_%28cp050%29_firmware, cpe:/o:siemens:siprotec_5_7sk82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sj81_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_6md86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7vu85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7ut86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6mu85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7st86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sd82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_6md85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sd82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sd86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sx82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sj82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7vk87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7ke85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7um85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj86_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sx85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sa82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7ut82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sy82_%28cp150%29_firmware, cpe:/o:siemens:siprotec_5_7sa82_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7st85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sj81_%28cp100%29_firmware, cpe:/o:siemens:siprotec_5_7sj85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sa87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ss85_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md84_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_6md89_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7ut87_%28cp300%29_firmware, cpe:/o:siemens:siprotec_5_7sl86_%28cp300%29_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 7/8/2025

Vulnerability Publication Date: 7/8/2025

Reference Information

CVE: CVE-2025-40742

CWE: 598

Detections

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