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Climatix Pol909 FirmwareOperating system · Siemens

CVE-2021-40366

HIGH · 7.4 CVSS v3.1 Published 2021-11-09
Fix available
A fix is available. Upgrade to 11.34 / 11.42 or later.
See remediation →
83/100
Remediation priority · High
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 Climatix POL909 (AWB module) (All versions < V11.42), Climatix POL909 (AWM module) (All versions < V11.34). The web server of affected devices transmits data without TLS encryption. This could allow an unauthenticated remote attacker in a man-in-the-middle position to read sensitive data, such as administrator credentials, or modify data in transit.

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

The Climatix POL909 web servers for both AWB and AWM modules transmit all data including administrator credentials in plaintext without TLS encryption, allowing man-in-the-middle attackers to intercept and read sensitive authentication data or modify traffic in transit.

MitigationEnable TLS encryption on the Climatix POL909 web servers by upgrading to V11.42 (AWB) or V11.34 (AWM) or later, and configure HTTPS with valid certificates to protect data in transit.

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
Climatix Pol909 FirmwareOperating system
Affected:< 11.34< 11.42

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
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

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. Identify the Climatix POL909 firmware version
    Access the web server admin interface or check the device/system documentation for the installed firmware version information. Look for version details in the system info or about section of the web UI.
    Affected if The firmware version is below 11.34 for AWM modules or below 11.42 for AWB modules
  2. Check if HTTPS/TLS is enabled on the web server
    Inspect the web server configuration settings within the Climatix POL909 admin panel. Look for network settings, security settings, or server configuration sections that control protocol selection (HTTP vs HTTPS).
    Affected if TLS encryption is disabled and the web server is accessible only over HTTP (plaintext)
  3. Verify the protocol used for authentication traffic
    Use a browser or network inspection tool to examine the connection protocol when logging into the web interface. Check if the login page and authentication requests use https:// or http:// in the URL.
    Affected if Authentication credentials are transmitted over HTTP instead of HTTPS
  4. Review network listener configuration
    Check the Climatix POL909 network settings to determine which ports and protocols the web server is listening on. Look for port 80 (HTTP) being active versus port 443 (HTTPS) or TLS-enabled ports.
    Affected if The web server is configured to listen on plaintext ports without TLS protection

A user is affected if they are running firmware versions below 11.34/11.42 AND the web server is operating without TLS encryption enabled, allowing credentials to be transmitted in plaintext.

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 11.34 / 11.42 or later
Fixed in 11.3411.42
Interim mitigation

Enable TLS encryption on the Climatix POL909 web servers by upgrading to V11.42 (AWB) or V11.34 (AWM) or later, and configure HTTPS with valid certificates to protect data in transit.

Recommended fix Moderate confidence

Climatix POL909 AWB module: V11.42 or later; AWM module: V11.34 or later

  1. 1. Identify which Climatix POL909 module is in use: AWB module or AWM module
  2. 2. Download the fixed firmware version from the official Siemens cert-portal source: V11.42 for AWB module, V11.34 for AWM module
  3. 3. Review Siemens upgrade documentation and release notes for any prerequisites
  4. 4. Create a backup of the current device configuration
  5. 5. Apply the firmware upgrade following the manufacturer's standard upgrade procedure
  6. 6. After upgrade, verify that the web server now uses TLS/HTTPS encryption
  7. 7. Test that the system functions normally with TLS enabled
Caveat Firmware upgrades may introduce compatibility changes; test in non-production environment first

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

Fix this in Climatix Pol909 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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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-2021-40366 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