Security readout for executives and security teams
Plain-English summary
Certain Weidmüller industrial WLAN devices include undocumented hard-coded credentials in diagnostic utilities. A low-privilege authenticated user can use this weakness to create custom diagnostic scripts, potentially compromising confidentiality, integrity, and availability of the device.
Executive priority
Treat this as high priority for industrial sites using affected Weidmüller WLAN devices. The issue can allow a low-privilege authenticated user to gain serious control over device behavior, but the provided sources do not show active exploitation.
Technical view
CVE-2021-33531 is a CWE-798 hard-coded credentials issue in multiple iw_* utilities on affected Weidmüller Industrial WLAN devices. The CVSS 3.1 score is 8.8, with network attack vector, low complexity, low privileges required, no user interaction, and high CIA impact.
Likely exposure
Exposure is most relevant to industrial environments using the listed Weidmüller IE-WL(T)-BL-AP-CL-XX or IE-WL(T)-VL-AP-CL-XX devices where an attacker can authenticate with a low-privilege account.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. Exploitation requires authenticated low-privilege access and the ability to send diagnostic scripts. Public evidence in the bundle is limited to the CVE and VDE advisory references.
Researcher notes
The source bundle identifies affected product families and part numbers, CVSS 8.8, and CWE-798. It does not include exploit details, proof of active exploitation, or a specific patch version, so remediation should be validated against vendor guidance.
Mitigation direction
- Check the VDE/Weidmüller advisory for supported firmware or remediation guidance.
- Restrict device access to trusted administrators and management networks.
- Remove unnecessary low-privilege accounts on affected devices.
- Monitor for unexpected diagnostic script creation or execution.
- Prioritize remediation where devices bridge sensitive industrial networks.
Validation and detection
- Inventory Weidmüller WLAN devices by exact model and part number.
- Compare deployed devices against the affected product list.
- Confirm whether low-privilege users can access diagnostic script functions.
- Review logs for unexpected diagnostic activity by non-administrators.
- Document vendor guidance status for each affected device.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-33531 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://cert.vde.com/en-us/advisories/vde-2021-026CVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.