high
7.2
CWE
287
Advisory Published
Updated

CVE-2021-33539: WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability

First published: Wed Jun 23 2021(Updated: )

In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass vulnerability exists in the hostname processing. A specially configured device hostname can cause the device to interpret selected remote traffic as local traffic, resulting in a bypass of web authentication. An attacker can send authenticated SNMP requests to trigger this vulnerability.

Credit: info@cert.vde.com

Affected SoftwareAffected VersionHow to fix
Weidmueller Ie-wl-bl-ap-cl-eu Firmware<=1.16.18
Weidmueller Ie-wl-bl-ap-cl-eu
Weidmueller Ie-wlt-bl-ap-cl-eu Firmware<=1.16.18
Weidmueller Ie-wlt-bl-ap-cl-eu
Weidmueller Ie-wl-bl-ap-cl-us Firmware<=1.16.18
Weidmueller Ie-wl-bl-ap-cl-us
Weidmueller Ie-wlt-bl-ap-cl-us Firmware<=1.16.18
Weidmueller Ie-wlt-bl-ap-cl-us
Weidmueller Ie-wl-vl-ap-br-cl-eu Firmware<=1.16.18
Weidmueller Ie-wl-vl-ap-br-cl-eu
Weidmueller Ie-wlt-vl-ap-br-cl-eu Firmware<=1.16.18
Weidmueller Ie-wlt-vl-ap-br-cl-eu
Weidmueller Ie-wl-vl-ap-br-cl-us Firmware<=1.16.18
Weidmueller Ie-wl-vl-ap-br-cl-us
Weidmueller Ie-wlt-vl-ap-br-cl-us Firmware<=1.16.18
Weidmueller Ie-wlt-vl-ap-br-cl-us
Weidmueller Ie-wl-bl-ap-cl-eu Firmware<=1.11.10
Weidmueller Ie-wlt-bl-ap-cl-eu Firmware<=v1.11.10
Weidmueller Ie-wl-bl-ap-cl-us Firmware<=1.11.10
Weidmueller Ie-wlt-bl-ap-cl-us Firmware<=1.11.10
Weidmueller Ie-wl-vl-ap-br-cl-eu Firmware<=1.11.10
Weidmueller Ie-wlt-vl-ap-br-cl-eu Firmware<=1.11.10
Weidmueller Ie-wl-vl-ap-br-cl-us Firmware<=1.11.10
Weidmueller Ie-wlt-vl-ap-br-cl-us Firmware<=1.11.10

Remedy

For IE-WL(T)-BL-AP-CL-XX versions V1.16.21 (Build 21010513) and greater are fixed. For IE-WL(T)-VL-AP-CL-XX versions V1.11.13 (Build 21010513) and greater are fixed.

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-33539?

    CVE-2021-33539 is a vulnerability in Weidmueller Industrial WLAN devices that allows an authentication bypass through hostname processing.

  • What is the severity of CVE-2021-33539?

    CVE-2021-33539 has a severity rating of 7.2 (high).

  • How does CVE-2021-33539 affect Weidmueller Industrial WLAN devices?

    CVE-2021-33539 affects multiple versions of Weidmueller Industrial WLAN devices, allowing an attacker to bypass web authentication.

  • How can CVE-2021-33539 be fixed?

    To fix CVE-2021-33539, users should apply the latest firmware update provided by Weidmueller.

  • Where can I find more information about CVE-2021-33539?

    More information about CVE-2021-33539 can be found on the VDE CERT website: https://cert.vde.com/en-us/advisories/vde-2021-026

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