CVE-2021-33529
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 · uneditedIn Weidmueller Industrial WLAN devices in multiple versions the usage of hard-coded cryptographic keys within the service agent binary allows for the decryption of captured traffic across the network from or to the device.
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 confidenceHard-coded cryptographic keys embedded in the service agent binary of Weidmueller Industrial WLAN devices allow attackers to decrypt captured network traffic, compromising confidentiality of communications to and from the device.
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<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10<= 1.16.18<= 1.11.10CVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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 checksWork through these to decide whether this CVE applies to you.
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Identify the Weidmueller device modelLocate the device label or check the device inventory for one of these product names: 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, or Ie Wlt Vl Ap Br Cl UsAffected if The device model matches one of these eight listed products
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Check the firmware versionAccess the device web interface, CLI, or management console and retrieve the current firmware version. Compare it against the affected version ranges: any version <= 1.16.18 or <= 1.11.10Affected if The installed firmware version is 1.16.18 or lower, or 1.11.10 or lower
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Confirm the service agent binary is in useVerify that the device WLAN service is active and communicating. The hard-coded keys reside in the service agent binary that handles device communicationsAffected if The WLAN service agent is running and handling network traffic to and from the device
A user is affected if they have one of the eight listed Weidmueller device models running firmware version 1.16.18 or lower, or 1.11.10 or lower, with the WLAN service agent active.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataApply vendor firmware updates when available; if no patch exists, replace affected devices. Implement network segmentation and monitor for traffic interception as compensating controls.
- Consultation12.0 h
- Implementation24.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $15,360.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-33529 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-33529 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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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.
- 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
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