---
id: CVE-2025-40833
title: >-
  The affected devices contain a null pointer dereference vulnerability while
  processing specially crafted IPv4 requests
summary: >-
  The affected devices contain a null pointer dereference vulnerability while
  processing specially crafted IPv4 requests. This could allow an attacker to
  cause denial of service condition. A manual restart is required to recover the
  system.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
published: '2026-05-12'
updated: '2026-07-14'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40833'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-392349.html'
    label: productcert@siemens.com
tags:
  - nvd
epss: 0.00324
epssPercentile: 0.22803
ingestedAt: '2026-07-14T10:36:25.469Z'
---

## Overview

The affected devices contain a null pointer dereference vulnerability while processing specially crafted IPv4 requests. This could allow an attacker to cause denial of service condition. A manual restart is required to recover the system.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.