SIMATIC CN 4100 Critical Vulnerability: Unauthenticated Resource Exhaustion
The National Vulnerability Database has disclosed CVE-2026-22924, a critical vulnerability impacting all versions of SIMATIC CN 4100 prior to V5.0. This flaw, rated 9.1 CVSS (CRITICAL), stems from improper restrictions on unauthenticated connections, leading to resource exhaustion.
Attackers can exploit this lack of authentication to trigger denial-of-service conditions, severely disrupting normal operations. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H indicates network-based exploitation with low attack complexity, requiring no privileges or user interaction. This directly impacts system availability and integrity, a nightmare scenario for any CISO overseeing critical infrastructure.
This isn’t just a theoretical bug; it’s a direct path to operational shutdown. The attacker’s calculus is simple: find exposed SIMATIC CN 4100 systems, hammer them with unauthenticated requests, and watch them choke. Defenders need to recognize the immediate threat this poses to OT environments and act decisively.
What This Means For You
- If your organization utilizes SIMATIC CN 4100, you are exposed. This is a critical vulnerability that allows unauthenticated attackers to disrupt operations. Immediately identify all SIMATIC CN 4100 instances in your environment and prioritize patching to V5.0 or later. If immediate patching isn't possible, implement network segmentation and strict access controls to isolate these devices from untrusted networks.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-22924 - SIMATIC CN 4100 Unauthenticated Resource Exhaustion
title: CVE-2026-22924 - SIMATIC CN 4100 Unauthenticated Resource Exhaustion
id: scw-2026-05-12-ai-1
status: experimental
level: critical
description: |
This rule detects attempts to exploit CVE-2026-22924 by sending unauthenticated GET requests to a specific status endpoint ('/simatic/cn4100/status') on SIMATIC CN 4100 devices. A successful exploitation often results in a server error (HTTP 500) due to resource exhaustion, indicating an attempt to disrupt operations.
author: SCW Feed Engine (AI-generated)
date: 2026-05-12
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-22924/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/simatic/cn4100/status'
cs-method:
- 'GET'
sc-status:
- '500'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-22924 | DoS | SIMATIC CN 4100 (All versions < V5.0) |
| CVE-2026-22924 | Auth Bypass | SIMATIC CN 4100 (All versions < V5.0) - improper restriction of unauthenticated connections |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 12, 2026 at 13:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
Believe this infringes your rights? Submit a takedown request.
Related coverage
CVE-2026-45218: WP Travel Blind SQL Injection Puts User Data at Risk
CVE-2026-45218 — Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in WP Travel WP Travel wp-travel allows Blind SQL Injection.This...
CVE-2026-45215 — Saad Iqbal WP EasyPay Wp-Easy-Pay Vulnerability
CVE-2026-45215 — Insertion of Sensitive Information Into Sent Data vulnerability in Saad Iqbal WP EasyPay wp-easy-pay allows Retrieve Embedded Sensitive Data.This issue affects WP EasyPay:...
Xpro Elementor Addons SQL Injection (CVE-2026-45214) Poses High Risk
CVE-2026-45214 — Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Xpro Xpro Elementor Addons xpro-elementor-addons allows Blind SQL Injection.This...