Siemens SIMATIC S7-1500 Improper Input Validation (CVE-2025-21724)

medium Tenable OT Security Plugin ID 503910

Synopsis

The remote OT asset is affected by a vulnerability.

Description

iommufd/iova_bitmap: Fix shift-out-of-bounds in iova_bitmap_offset_to_index(). Resolve a UBSAN shift-out-of-bounds issue in iova_bitmap_offset_to_index() where shifting the constant 1 (of type int) by bitmap->mapped.pgshift (an unsigned long value) could result in undefined behavior. The constant 1 defaults to a 32-bit int, and when pgshift exceeds 31 (e.g., pgshift = 63) the shift operation overflows, as the result cannot be represented in a 32-bit type.

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: 503910

Version: 1.1

Type: remote

Family: Tenable.ot

Published: 11/13/2025

Updated: 11/13/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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_cpu_firmware:3.1.5, cpe:/o:siemens:siplus_s7-1500_cpu_firmware:3.1.5

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-2025-21724

CWE: 20

ICSA: 23-348-10

Detections

Analytics