Siemens SCALANCE and RUGGEDCOM Incorrect Authorization (CVE-2025-40568)

medium Tenable OT Security Plugin ID 505078

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An internal session termination functionality in the web interface of affected products contains an incorrect authorization check vulnerability. This could allow an authenticated remote attacker with guest role to terminate legitimate users' sessions.

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

- RUGGEDCOM RST2428P (6GK6242-6PA00), SCALANCE XC316-8 (6GK5324-8TS00-2AC2), SCALANCE XC324-4 (6GK5328-4TS00-2AC2), SCALANCE XC324-4 EEC (6GK5328-4TS00-2EC2), SCALANCE XC332 (6GK5332-0GA00-2AC2), SCALANCE XC416-8 (6GK5424-8TR00-2AC2), SCALANCE XC424-4 (6GK5428-4TR00-2AC2), SCALANCE XC432 (6GK5432-0GR00-2AC2), SCALANCE XCH328 (6GK5328-4TS01-2EC2), SCALANCE XCM324 (6GK5324-8TS01-2AC2), SCALANCE XCM328 (6GK5328-4TS01-2AC2), SCALANCE XR302-32 (6GK5334-5TS00-2AR3), SCALANCE XR302-32 (6GK5334-5TS00-3AR3), SCALANCE XR302-32 (6GK5334-5TS00-4AR3), SCALANCE XR322-12 (6GK5334-3TS00-2AR3), SCALANCE XR322-12 (6GK5334-3TS00-3AR3), SCALANCE XR322-12 (6GK5334-3TS00-4AR3), SCALANCE XR326-8 (6GK5334-2TS00-2AR3), SCALANCE XR326-8 (6GK5334-2TS00-3AR3), SCALANCE XR326-8 (6GK5334-2TS00-4AR3), SCALANCE XR326-8 EEC (6GK5334-2TS00-2ER3), SCALANCE XR502-32 (6GK5534-5TR00-2AR3), SCALANCE XR502-32 (6GK5534-5TR00-3AR3), SCALANCE XR502-32 (6GK5534-5TR00-4AR3), SCALANCE XR522-12 (6GK5534-3TR00-2AR3), SCALANCE XR522-12 (6GK5534-3TR00-3AR3), SCALANCE XR522-12 (6GK5534-3TR00-4AR3), SCALANCE XR526-8 (6GK5534-2TR00-2AR3), SCALANCE XR526-8 (6GK5534-2TR00-3AR3), SCALANCE XR526-8 (6GK5534-2TR00-4AR3), SCALANCE XRH334 (24 V DC, 8xFO, CC) (6GK5334-2TS01-2ER3), SCALANCE XRM334 (2x230 V AC, 8xFO) (6GK5334-2TS01-4AR3), SCALANCE XRM334 (2x230 V AC, 12xFO) (6GK5334-3TS01-4AR3), SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-4AR3), SCALANCE XRM334 (24 V DC, 8xFO) (6GK5334-2TS01-2AR3), SCALANCE XRM334 (24 V DC, 12xFO) (6GK5334-3TS01-2AR3), SCALANCE XRM334 (24V DC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-2AR3), SCALANCE XRM334 (230 V AC, 8xFO) (6GK5334-2TS01-3AR3), SCALANCE XRM334 (230 V AC, 12xFO) (6GK5334-3TS01-3AR3), SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+) (6GK5334-5TS01-3AR3): Update to V3.2 or later version
- SCALANCE XCM332 (6GK5332-0GA01-2AC2): Update to V3.2 or later version

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-693776 in HTML and CSAF.

Plugin Details

Severity: Medium

ID: 505078

File Name: tenable_ot_siemens_CVE-2025-40568.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 2/10/2026

Updated: 2/14/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v3

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 1.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:siemens:scalance_xrm334_%282x230_v_ac%2c_12xfo%29_firmware:3.2, cpe:/o:siemens:scalance_xcm324_firmware:3.2, cpe:/o:siemens:scalance_xch328_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%2824_v_dc%2c_12xfo%29_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%2824_v_dc%2c_8xfo%29_firmware:3.2, cpe:/o:siemens:scalance_xcm328_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%282x230_v_ac%2c_8xfo%29_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%28230_v_ac%2c_12xfo%29_firmware:3.2, cpe:/o:siemens:scalance_xrh334_%2824_v_dc%2c_8xfo%2c_cc%29_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%28230v_ac%2c_2x10g%2c_24xsfp%2c_8xsfp%2b%29_firmware:3.2, cpe:/o:siemens:ruggedcom_rst2428p_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%2824v_dc%2c_2x10g%2c_24xsfp%2c_8xsfp%2b%29_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%282x230v_ac%2c_2x10g%2c_24xsfp%2c_8xsfp%2b%29_firmware:3.2, cpe:/o:siemens:scalance_xrm334_%28230_v_ac%2c_8xfo%29_firmware:3.2, cpe:/o:siemens:scalance_xcm332_firmware

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 6/10/2025

Vulnerability Publication Date: 6/10/2025

Reference Information

CVE: CVE-2025-40568

CWE: 863

Detections

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