Detections
Analytics

Siemens SIMATIC and SCALANCE Devices Improper Validation of Array Index (CVE-2025-21692)

high Tenable OT Security Plugin ID 503404

Synopsis

The remote OT asset is affected by a vulnerability.

Description

net: sched: fix ets qdisc OOB Indexing

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

Solution

Refer to the vendor advisory.

See Also

https://cert-portal.siemens.com/productcert/html/ssa-265688.html

https://cert-portal.siemens.com/productcert/html/ssa-355557.html

Plugin Details

Severity: High

ID: 503404

File Name: tenable_ot_siemens_CVE-2025-21692.nasl

Version: 1.3

Type: remote

Family: Tenable.ot

Published: 10/27/2025

Updated: 3/5/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: High

Score: 7.4

CVSS v3

Risk Factor: High

Base Score: 7.8

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

Vulnerability Information

CPE: cpe:/o:siemens:scalance_xc-400_series_firmware, cpe:/o:siemens:scalance_xr-500wg_series_firmware, cpe:/o:siemens:scalance_xr-300_series_firmware, cpe:/o:siemens:scalance_xc-300_series_firmware, cpe:/o:siemens:scalance_xr-500_series_firmware, cpe:/o:siemens:simatic_s7-1500_tm_mfp

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 4/9/2024

Vulnerability Publication Date: 4/9/2024

Reference Information

CVE: CVE-2025-21692

CWE: 129

ICSA: 25-226-07