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CVE-2021-33533
In Weidmueller Industrial WLAN devices in multiple versions an exploitable command injection vulnerability exists in the iw_webs functionality. A specially crafted iw_serverip parameter 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.
This record: live connection— last retrieved: 7 November 2026 at 02:35.
Vendor
Products
IE-WL-BL-AP-CL-EU, IE-WL-BL-AP-CL-US, IE-WLT-BL-AP-CL-EU, IE-WLT-BL-AP-CL-US, IE-WLT-VL-AP-BR-CL-EU, IE-WLT-VL-AP-BR-CL-US and 2 more
up to version <=V1.16.18 (Build 18081617)
Published
25 June 2021
Last modified
17 June 2026
Taken directly from NVD, CISA or the vendor — sometimes in English, unchanged from the source.
In Weidmueller Industrial WLAN devices in multiple versions an exploitable command injection vulnerability exists in the iw_webs functionality. A specially crafted iw_serverip parameter 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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
NETWORK
Privileges required
LOW
User interaction
NONE
Confidentiality
High
Integrity
High
Availability
High
Probability of exploitation within 30 days
1.7%
Percentile
78e
Source: FIRST.org, updated on 6 November 2026.
For all potential vulnerabilities, customers can download a patched firmware to secure their Industrial WLAN devices properly. Please follow the procedure below to download and install the latest firmware for your device: 1. Use the link: [www.weidmueller.com](www.weidmueller.com) 2. Enter the product number of the Industrial WLAN device you want to update in the search field on the webpage and press "Enter". 3. On the next page, expand the drop-down menu **"Downloads"**. 4. Download the respective firmware from the download table. 5. Install the firmware on your device. Patched firmware versions for all affected products | Product number | Product name | Firmware version | |---------------|-----------------------------------|------------------------------------------| | 2536600000 | IE-WL-BL-AP-CL-EU | <= V1.16.21 (Build 21010513) | | 2536650000 | IE-WLT-BL-AP-CL-EU | <= V1.16.21 (Build 21010513) | | 2536660000 | IE-WL-BL-AP-CL-US | <= V1.16.21 (Build 21010513) | | 2536670000 | IE-WLT-BL-AP-CL-US | <= V1.16.21 (Build 21010513) | | 2536680000 | IE-WL-VL-AP-BR-CL-EU | <= V1.11.13 (Build 21010513) | | 2536690000 | IE-WLT-VL-AP-BR-CL-EU | <= V1.11.13 (Build 21010513) | | 2536700000 | IE-WL-VL-AP-BR-CL-US | <= V1.11.13 (Build 21010513) | | 2536710000 | IE-WLT-VL-AP-BR-CL-US | <= V1.11.13 (Build 21010513) | If a firmware update is available for your device, please follow the steps above to install it.
Our own interpretation and context for the source data above.
IACS Radar assessment
Our own interpretation and context for this vulnerability — not an official source.
IACS Radar priority score
Based on CVSS 8.8, EPSS 1.7%, industrial relevance 40/100.
Combines CVSS, EPSS, KEV status, industrial relevance and exposure relevance — a complement to, not a replacement for, the individual scores below and above.
Conditions for exploitation
Operational impact & energy relevance
Possible loss of visibility of or control over the process upon successful exploitation.
No strong energy-sector-specific signals recognised; general OT/ICS relevance.
Recommended defensive measures
Industrial relevance score
Classification is provisional; manual verification by an OT security analyst is recommended.
Classified by IACS Radar-analysepijplijn (geautomatiseerd) on 7 November 2026.
IEC 62443 mapping
Automatic IACS Radar assessment based on the reported CWE weakness classification; not an official certification statement.