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CVE Record

CVE-2021-40222: Rittal CMC PU III Web management Version affected: V3.11.00_2.

Rittal CMC PU III Web management Version affected: V3.11.00_2. Version fixed: V3.17.10 is affected by a remote code execution vulnerablity. It is possible to introduce shell code to create a reverse shell in the PU-Hostname field of the TCP/IP Configuration dialog. Web application fails to sanitize user input on Network TCP/IP configuration page. This allows the attacker to inject commands as root on the device which will be executed once the data is received.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-40222 is a remote code execution flaw in Rittal CMC PU III web management. A user able to reach and use the TCP/IP configuration page could place malicious input in the hostname field, leading the device to run commands as root. This is serious for facilities using these devices to monitor physical infrastructure.

Executive priority

Prioritize remediation where these devices support data center, industrial, or facility operations. Root-level RCE on infrastructure monitoring equipment can create operational disruption risk even without confirmed active exploitation.

Technical view

The source describes command injection through the PU-Hostname field in the Network TCP/IP configuration page. The web application fails to sanitize input, allowing commands to execute as root once the submitted data is received. The bundle names V3.11.00_2 as affected and V3.17.10 as fixed, with no CVSS or CWE provided.

Likely exposure

Exposure is most likely where Rittal CMC PU III web management is reachable by administrators, internal users, vendors, or remote access paths. Internet-facing management interfaces would materially increase risk, but the bundle does not confirm how commonly these devices are exposed.

Exploitation context

The bundle does not show CISA KEV listing or confirmed active exploitation. It does include a public GitHub reference, so public technical details may exist. Treat this as credible RCE risk, but do not assume exploitation is occurring without separate evidence.

Researcher notes

Evidence is sparse: no CVSS, CWE, CPE, or detailed vendor advisory is included in the bundle. The key confirmed facts are affected version V3.11.00_2, fixed version V3.17.10, hostname-field command injection, and root command execution impact.

Mitigation direction

  • Identify all Rittal CMC PU III devices and firmware versions.
  • Upgrade affected V3.11.00_2 devices to V3.17.10 or vendor-recommended fixed firmware.
  • Restrict web management access to trusted administration networks only.
  • Remove internet exposure for device management interfaces.
  • Check vendor guidance for any additional hardening or recovery steps.

Validation and detection

  • Confirm whether any deployed device runs V3.11.00_2.
  • Verify the web management interface is not internet-accessible.
  • Review recent TCP/IP configuration and hostname changes.
  • Check device logs for unexpected administrative configuration activity.
  • Confirm upgraded devices report V3.17.10 or later vendor-approved firmware.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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ATT&CK lookup starting points

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description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

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cve · low confidence lookup

CVE-2021-40222 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.