Siemens SIMATIC Devices Use After Free (CVE-2025-21764)

high Tenable OT Security Plugin ID 503652

Synopsis

The remote OT asset is affected by a vulnerability.

Description

ndisc: use RCU protection in ndisc_alloc_skb()

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: High

ID: 503652

File Name: tenable_ot_siemens_CVE-2025-21764.nasl

Version: 1.3

Type: Remote

Family: Tenable.ot

Published: 10/27/2025

Updated: 7/30/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 57.12

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: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-2025-21764

CWE: 416

ICSA: 26-209-04

Detections

Analytics