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Ie Wl Bl Ap Cl Eu FirmwareOperating system · Weidmueller

CVE-2021-33531

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 use of hard-coded credentials vulnerability exists in multiple iw_* utilities. The device operating system contains an undocumented encryption password, allowing for the creation of custom diagnostic scripts. An attacker can send diagnostic scripts 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 · moderate confidence

Weidmueller Industrial WLAN devices contain hard-coded credentials (undocumented encryption password) in multiple iw_* utilities within the device OS. An authenticated low-privilege user can exploit this to create and execute custom diagnostic scripts, potentially allowing privilege escalation or unauthorized access to sensitive functions.

MitigationUpdate to vendor patched firmware version and rotate all hard-coded/default credentials. Restrict access to diagnostic utilities and implement least-privilege access controls.

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 web interface or administrative console and locate the device information or status page to confirm it is a Weidmueller Industrial WLAN device from the Ie Wl or Ie Wlt series
    Affected if The device model matches any of the affected product names (Ie Wl Bl Ap Cl, Ie Wlt Bl Ap Cl, Ie Wl Vl Ap Br Cl, or Ie Wlt Vl Ap Br Cl) in EU or US variants
  2. Check the firmware version
    In the device web interface or administrative console, navigate to System, Status, or About section to retrieve the installed firmware version
    Affected if The firmware version is 1.16.18 or lower, OR 1.11.10 or lower (any version up to and including these)

A user is affected if they have a Weidmueller Industrial WLAN device from the listed models running firmware version 1.16.18 or lower, or 1.11.10 or lower, which contains hard-coded credentials in iw_* utilities that could allow privilege escalation.

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

Update to vendor patched firmware version and rotate all hard-coded/default credentials. Restrict access to diagnostic utilities and implement least-privilege access controls.

Recommended fix Moderate confidence

Weidmueller Industrial WLAN firmware version > 1.16.18 or > 1.11.10 (exact fixed release to be confirmed from vendor)

  1. 1. Identify the exact Weidmueler Industrial WLAN device model from the affected product list (Ie Wl, Ie Wlt, etc.)
  2. 2. Check the current firmware version installed on the device
  3. 3. Visit cert.vde.com or the official Weidmueller support portal to obtain the latest firmware version
  4. 4. If a newer firmware version exists (beyond 1.16.18 or 1.11.10), download it from the official Weidmueller website
  5. 5. Review the firmware release notes to confirm the fix for CVE-2021-33531 is included
  6. 6. Apply the firmware update following the vendor's documented upgrade procedure
  7. 7. After updating, verify the undocumented encryption password has been removed from the iw_* utilities
  8. 8. Change any default or hard-coded credentials that may have been in use
Caveat Review Weidmueller release notes for any configuration or compatibility changes between current and new firmware versions

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
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing6.0 h
  • Review / QA4.0 h
28.0 hours of engineering $4,980
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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-2021-33531 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