Siemens SIMATIC S7-1500 TM MFP Improper Input Validation (CVE-2026-23291)

medium Tenable OT Security Plugin ID 506429

Synopsis

The remote OT asset is affected by a vulnerability.

Description

In the Linux kernel, the following vulnerability has been resolved:

nfc: pn533: properly drop the usb interface reference on disconnect

When the device is disconnected from the driver, there is a 'dangling' reference count on the usb interface that was grabbed in the probe callback. Fix this up by properly dropping the reference after we are done with it.

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.

Plugin Details

Severity: Medium

ID: 506429

File Name: tenable_ot_siemens_CVE-2026-23291.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 10/20/2026

Updated: 10/20/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

CVSS v3

Risk Factor: Medium

Base Score: 5.5

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

Vulnerability Information

CPE: cpe:/o:siemens:simatic_s7-1500_tm_mfp

Required KB Items: Tenable.ot/Siemens

Exploit Ease: No known exploits are available

Patch Publication Date: 10/13/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-23291

CWE: 20

Detections

Analytics