Honeywell Control Network Module: Critical RCE Vulnerability Discovered
The National Vulnerability Database has disclosed CVE-2026-5433, a critical command injection vulnerability in the web interface of Honeywell Control Network Module (CNM). This flaw, rated 9.1 CVSS (CRITICAL), allows an attacker to achieve Remote Code Execution (RCE) by injecting command delimiters.
This isn’t just a theoretical bug; it’s a direct path to compromise. An attacker with privileged access to the web interface could leverage this to gain full control over the CNM. In an industrial control system (ICS) environment, this translates to potential operational disruption, data manipulation, or even physical damage, depending on the CNM’s role.
While the National Vulnerability Database did not specify affected products, the criticality demands immediate attention from any organization utilizing Honeywell CNM. Defenders need to identify all instances of this module within their environment and prioritize patching or isolating these systems from untrusted networks.
What This Means For You
- If your organization uses Honeywell Control Network Modules, you need to identify all instances immediately. This RCE vulnerability is critical. Check for vendor advisories and apply patches as soon as they become available. If patching isn't possible, isolate these systems from external access and implement strict access controls on the web interface.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 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-2026-5433 - Honeywell CNM Web Interface Command Injection
title: CVE-2026-5433 - Honeywell CNM Web Interface Command Injection
id: scw-2026-05-21-ai-1
status: experimental
level: critical
description: |
Detects potential command injection attempts targeting the Honeywell Control Network Module (CNM) web interface. This rule looks for common command delimiters within the query string of requests targeting a known CNM web interface path, which is indicative of exploiting CVE-2026-5433.
author: SCW Feed Engine (AI-generated)
date: 2026-05-21
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-5433/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- ';'
- '|'
- '&&'
- '||'
- '`'
- '$()'
cs-uri|contains:
- '/ Honeywell CNM Web Interface Path'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-5433 | Command Injection | Honeywell Control Network Module (CNM) web interface |
| CVE-2026-5433 | RCE | Honeywell Control Network Module (CNM) via command delimiters |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 21, 2026 at 12:16 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.
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