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7kg9501 0aa01 2aa1 FirmwareOperating system · Siemens

CVE-2021-44165

HIGH · 7.2 CVSS v3.1 Published 2021-12-14
Fix available
A fix is available. Upgrade to 2.41 or later.
See remediation →
78/100
Remediation priority · High
Remotely reachable 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 POWER METER SICAM Q100 (All versions < V2.41), POWER METER SICAM Q100 (All versions < V2.41), POWER METER SICAM Q100 (All versions < V2.41), POWER METER SICAM Q100 (All versions < V2.41). The affected firmware contains a buffer overflow vulnerability in the web application that could allow a remote attacker with engineer or admin priviliges to potentially perform remote code execution.

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 · moderate confidence

Buffer overflow vulnerability in the web application component of POWER METER SICAM Q100 firmware. A remote authenticated attacker with engineer or admin privileges can exploit the overflow to achieve remote code execution.

MitigationUpgrade POWER METER SICAM Q100 firmware to version V2.41 or later to address the vulnerability.

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
7kg9501 0aa01 2aa1 FirmwareOperating system
Affected:< 2.41
7kg9501 0aa31 0aa1 FirmwareOperating system
Affected:< 2.41
7kg9501 0aa31 2aa1 FirmwareOperating system
Affected:< 2.41
7kg9501 0aa01 0aa1 FirmwareOperating system
Affected:< 2.41

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

CVSS:3.1/AV:N/AC:L/PR:H/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. Identify the device model number
    Locate the product label on the POWER METER SICAM Q100 device or check the device inventory documentation. Look for the full product code which should be one of: 7kg9501 0aa01 2aa1, 7kg9501 0aa31 0aa1, 7kg9501 0aa31 2aa1, or 7kg9501 0aa01 0aa1.
    Affected if The device model matches one of the four listed product codes.
  2. Check the installed firmware version
    Access the device web interface and navigate to the System Information or About page, or use the device's management console to query the firmware version. The version is typically displayed as a numeric value such as V2.40, V2.30, etc.
    Affected if The displayed firmware version is below 2.41 (for example, 2.40, 2.38, 2.30, etc.).
  3. Verify the web application component is active
    Attempt to access the device web interface by entering the device IP address in a web browser. Confirm that a login page or web application loads.
    Affected if The web interface is accessible and responds to HTTP/HTTPS requests, indicating the web application component is enabled.
  4. Assess network accessibility of the web interface
    Determine if the device web management port (typically 80 or 443) is exposed to network segments accessible by unauthorized users. Use network scanning tools or review firewall rules to check external or untrusted network exposure.
    Affected if The web interface is reachable from network segments that do not require engineer or admin credentials for access.

You are affected if your device uses any of the four listed product codes, runs firmware version lower than 2.41, and has the web application component enabled and accessible.

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 2.41 or later
Fixed in 2.41
Interim mitigation

Upgrade POWER METER SICAM Q100 firmware to version V2.41 or later to address the vulnerability.

Recommended fix High confidence

Firmware V2.41 or later for POWER METER SICAM Q100

  1. Verify the current firmware version of the POWER METER SICAM Q100 device
  2. Download firmware version V2.41 or later from the Siemens cert-portal.siemens.com or official Siemens support channels
  3. Review upgrade documentation and ensure proper backup of device configuration
  4. Upload and install firmware V2.41 or later following Siemens installation instructions
  5. After upgrade, verify the firmware version has been successfully updated
  6. Test that the web application and device functionality operate normally
Caveat Review Siemens release notes for any configuration or compatibility changes between your current version and V2.41

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

Fix this in 7kg9501 0aa01 2aa1 Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation2.0 h
  • Testing3.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,770
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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-2021-44165 in production — separate from our analysis above.

No notes yet

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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