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Cmc Pu Iii 7030.000 FirmwareOperating system · Rittal

CVE-2021-40223

MEDIUM · 5.4 CVSS v3.1 Published 2021-09-09
Fix available
A fix is available. Upgrade to 3.17.10 or later.
See remediation →
58/100
Remediation priority · Elevated
Public exploit Remotely reachable

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
Rittal CMC PU III Web management (version V3.11.00_2) fails to sanitize user input on several parameters of the configuration (User Configuration dialog, Task Configuration dialog and set logging filter dialog). This allows an attacker to backdoor the device with HTML and browser-interpreted content (such as JavaScript or other client-side scripts). The XSS payload will be triggered when the user accesses some specific sections of the application.

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
How this class of weakness works · CWE-79

Untrusted input is placed into a web page without being neutralised, so an attacker's markup or script executes in another user's browser. That can hijack sessions, capture keystrokes, or silently perform actions as the victim. Fixing it properly means context-aware output encoding everywhere data meets HTML, backed by a content-security policy as a second line of defence.

General guidance for the cross-site scripting (xss) class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

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
Cmc Pu Iii 7030.000 FirmwareOperating system
Affected:>= 3.11.00_2, < 3.17.10

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
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

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 3.17.10 or later
Fixed in 3.17.10
Recommended fix Moderate confidence

Firmware version 3.17.10 or later

  1. Identify the current firmware version of the Rittal CMC PU III 7030.000 device via the web management interface or physical console
  2. Download the firmware version 3.17.10 or later from the official Rittal support website or authorized distributor
  3. Access the CMC PU III web management interface and navigate to the firmware update section (typically under Administration > Firmware Update)
  4. Upload the firmware file and initiate the upgrade process
  5. Wait for the upgrade to complete and verify the device restarts successfully
  6. Log back into the web management interface and confirm the firmware version displays 3.17.10 or later
  7. Test the User Configuration dialog, Task Configuration dialog, and set logging filter dialog to verify XSS payloads are no longer executable
Caveat Review Rittal release notes for version 3.17.10 to check for any configuration changes or feature modifications that may require adjustment

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

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $900. Get the upgrade done

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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-2021-40223 in production — separate from our analysis above.

No notes yet

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What this is

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  • Version or environment caveats, and links to real fixes
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