high
8.8
CWE
134
Advisory Published
Updated

CVE-2021-33535: WEIDMUELLER: WLAN devices affected by exploitable format string vulnerability

First published: Fri Jun 25 2021(Updated: )

In Weidmueller Industrial WLAN devices in multiple versions an exploitable format string vulnerability exists in the iw_console conio_writestr functionality. A specially crafted time server entry can cause an overflow of the time server buffer, resulting in remote code execution. An attacker can send commands while authenticated as a low privilege user 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<=1.11.10
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-2021-33535?

    CVE-2021-33535 is a format string vulnerability that exists in the iw_console conio_writestr functionality of Weidmueller Industrial WLAN devices.

  • How severe is CVE-2021-33535?

    CVE-2021-33535 has a severity rating of 8.8 (high).

  • Which versions of Weidmueller Industrial WLAN devices are affected by CVE-2021-33535?

    Multiple versions of Weidmueller Industrial WLAN devices are affected including Ie-wl-bl-ap-cl-eu Firmware up to version 1.16.18 and Ie-wl-bl-ap-cl-eu Firmware up to version 1.11.10.

  • How does CVE-2021-33535 work?

    CVE-2021-33535 occurs when a specially crafted time server entry causes an overflow of the time server buffer in the affected devices, leading to remote code execution.

  • Where can I find more information about CVE-2021-33535?

    More information about CVE-2021-33535 can be found at the following reference: [VDE-2021-026](https://cert.vde.com/en-us/advisories/vde-2021-026).

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