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Simatic Cn 4100 FirmwareOperating system · Siemens

CVE-2024-32740

CRITICAL · 9.8 CVSS v3.1 Published 2024-05-14
Fix available
A fix is available. Upgrade to 3.0 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A vulnerability has been identified in SIMATIC CN 4100 (All versions < V3.0). The affected device contains undocumented users and credentials. An attacker could misuse the credentials to compromise the device locally or over the network.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

Hardcoded/undocumented credentials exist in SIMATIC CN 4100 devices versions before V3.0. These hidden credentials can be discovered and exploited by attackers to gain unauthorized administrative access to the device locally or remotely.

MitigationUpgrade SIMATIC CN 4100 firmware to version V3.0 or later to remove undocumented credentials. If immediate upgrade is not possible, network segmentation and access controls should be enforced to limit exposure.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Simatic Cn 4100 FirmwareOperating system
Affected:< 3.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm device model is SIMATIC CN 4100
    Access the device web interface, management console, or use device discovery tools to verify the exact model number displayed in the device information or system status
    Affected if The device is a Siemens SIMATIC CN 4100 unit
  2. Locate firmware version information
    Check the device firmware version through the web interface (typically under System > Device Information or About), the TIA Portal engineering software, or the device command line interface using 'version' or 'show system' commands
    Affected if Unable to retrieve firmware version information from the device
  3. Compare installed firmware version to V3.0
    Document the exact firmware version string shown in the device information and compare it numerically against V3.0 - versions displayed as V2.x, V1.x, or any version number lower than 3.0 are before the fixed release
    Affected if Installed firmware version is below V3.0 (e.g., V2.9, V2.1, V1.0)
  4. Verify undocumented credentials are present
    Review device configuration files, backup configurations, or system logs for any hardcoded or undocumented user accounts not created by the administrator - these credentials are embedded in the firmware for versions before V3.0
    Affected if Unknown or undocumented administrative accounts exist in the device configuration

The environment is affected if the SIMATIC CN 4100 device is running firmware version V3.0 or earlier, as these versions contain undocumented hardcoded credentials that provide administrative access.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 3.0 or later
Fixed in 3.0
Interim mitigation

Upgrade SIMATIC CN 4100 firmware to version V3.0 or later to remove undocumented credentials. If immediate upgrade is not possible, network segmentation and access controls should be enforced to limit exposure.

Recommended fix High confidence

Simatic CN 4100 Firmware V3.0

  1. 1. Identify the current firmware version of the Simatic CN 4100 device via the device web interface or management console
  2. 2. Navigate to the Siemens Industry Online Support portal (support.industry.siemens.com) and locate the Simatic CN 4100 firmware V3.0 or later download
  3. 3. Download the firmware update package, ensuring it is sourced from the official Siemens cert-portal or support portal
  4. 4. Follow the standard Siemens firmware update procedure, typically via the device web interface under 'Firmware Update' or using TIA Portal with the appropriate loader tool
  5. 5. Upload and apply the firmware V3.0 to the device, allowing sufficient time for the update process to complete without interruption
  6. 6. After the device restarts, verify the firmware version has been updated to V3.0 or higher
  7. 7. As a security best practice following any firmware update, review and update all device credentials, ensuring any default or undocumented accounts have been removed or properly secured
Caveat Firmware updates may require compatibility verification with connected systems; review release notes for any configuration changes

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Simatic Cn 4100 Firmware Scoped from the published advisory
  • Consultation6.0 h
  • Implementation4.0 h
  • Testing6.0 h
  • Review / QA3.0 h
19.0 hours of engineering $3,360
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-32740 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data