Siemens SCALANCE Devices Authorization Bypass Through User-Controlled Key (CVE-2025-40805)

critical Tenable OT Security Plugin ID 505079

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an unauthenticated remote attacker to circumvent authentication and impersonate a legitimate user. Successful exploitation requires that the attacker has learned the identity of a legitimate user.

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Solution

Refer to the vendor advisory.

Plugin Details

Severity: Critical

ID: 505079

File Name: tenable_ot_siemens_CVE-2025-40805.nasl

Version: 1.1

Type: remote

Family: Tenable.ot

Published: 2/10/2026

Updated: 2/10/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v3

Risk Factor: Critical

Base Score: 10

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_lpe9433_firmware:2.2, cpe:/o:siemens:scalance_lpe9413_firmware:2.2

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 1/13/2026

Reference Information

CVE: CVE-2025-40805

CWE: 639

ICSA: 26-015-08

Detections

Analytics