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Ie Wl Bl Ap Cl Eu FirmwareOperating system · Weidmueller

CVE-2021-33532

HIGH · 8.8 CVSS v3.1 Published 2021-06-25
Fix available
A fix is available. Upgrade to after 1.16.18 or later.
See remediation →
94/100
Remediation priority · Urgent
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
In Weidmueller Industrial WLAN devices in multiple versions an exploitable command injection vulnerability exists in the iw_webs functionality. A specially crafted diagnostic script file name can cause user input to be reflected in a subsequent iw_system call, resulting in remote control over the device. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

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

Command injection vulnerability in Weidmueller Industrial WLAN devices in the iw_webs functionality. User-supplied input from a diagnostic script file name is improperly reflected into an iw_system call without sanitization, allowing authenticated low-privilege users to execute arbitrary commands and gain full remote control of the device.

MitigationApply vendor-supplied firmware patches for affected versions; restrict network access to management interfaces and implement network segmentation for industrial devices until patching is possible.

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
Ie Wl Bl Ap Cl Eu FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wlt Bl Ap Cl Eu FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wl Bl Ap Cl Us FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wlt Bl Ap Cl Us FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wl Vl Ap Br Cl Eu FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wlt Vl Ap Br Cl Eu FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wl Vl Ap Br Cl Us FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10
Ie Wlt Vl Ap Br Cl Us FirmwareOperating system
Affected:<= 1.16.18<= 1.11.10

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
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/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
    Access the device's web management interface or check the device label/ SNMP sysDescr to confirm it is a Weidmueller Industrial WLAN device (Ie Wl or Ie Wlt series)
    Affected if The device model matches one of: Ie Wl Bl Ap Cl Eu, Ie Wlt Bl Ap Cl Eu, Ie Wl Bl Ap Cl Us, Ie Wlt Bl Ap Cl Us, Ie Wl Vl Ap Br Cl Eu, Ie Wlt Vl Ap Br Cl Eu, Ie Wl Vl Ap Br Cl Us, Ie Wlt Vl Ap Br Cl Us
  2. Check the firmware version
    Log into the web interface and navigate to System > Firmware/Version or use SNMP to query the firmware version. Compare against the affected ranges.
    Affected if The firmware version is 1.16.18 or lower, OR 1.11.10 or lower (the device has two version tracks)
  3. Verify iw_webs is accessible
    Confirm the web management interface (iw_webs) is reachable on the device. Try accessing the diagnostic or system utilities section of the web UI.
    Affected if The web interface is accessible and includes diagnostic/script execution features
  4. Check authentication status
    Determine if you can authenticate to the web interface with low-privilege credentials, or if default credentials are still in use.
    Affected if Low-privilege or default credentials provide access to the web management interface

If the device is a Weidmueller Industrial WLAN model from the affected list, runs firmware version 1.16.18 or lower (or 1.11.10 or lower), and the web interface is accessible with authenticated access, the environment is affected by CVE-2021-33532.

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 a release after 1.16.18
Interim mitigation

Apply vendor-supplied firmware patches for affected versions; restrict network access to management interfaces and implement network segmentation for industrial devices until patching is possible.

Recommended fix Moderate confidence

Weidmueller Industrial WLAN firmware version > 1.16.18 (or > 1.11.10 depending on device series)

  1. Identify the exact Weidmueller Industrial WLAN device model from the affected product list (Ie Wl Bl Ap Cl Eu, Ie Wlt Bl Ap Cl Eu, Ie Wl Vl Ap Br Cl Eu, etc.)
  2. Access the device administrative interface or console
  3. Navigate to the firmware update section
  4. Check current firmware version (confirm it is <= 1.16.18 or <= 1.11.10)
  5. Obtain the latest firmware version from Weidmueller's official support website or contact Weidmueller technical support
  6. Upload and apply the updated firmware following Weidmueller's official upgrade procedure
  7. Verify the firmware update was successful
  8. Confirm the new firmware version is beyond 1.16.18 and 1.11.10
Caveat Review Weidmueller release notes for any configuration or compatibility changes between versions before upgrading

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

Fix this in Ie Wl Bl Ap Cl Eu Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA2.0 h
20.0 hours of engineering $3,500
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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-2021-33532 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