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

High 8.8 Published 25 Jun 2021 Updated 17 Sep 2024

Authenticated low-privilege users can trigger a format string vulnerability in Weidmüller WLAN devices to achieve remote code execution.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-33535?

CVE-2021-33535 is a high-severity vulnerability in Weidmüller IE-WL(T)-BL-AP-CL-XX, published on 25 Jun 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

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.

Weakness: CWE-134

Which versions are affected by CVE-2021-33535?

It affects 8 products.

Products include Weidmueller Ie-Wl-Bl-Ap-Cl-Eu Firmware, Weidmueller Ie-Wl-Bl-Ap-Cl-Us Firmware, Weidmueller Ie-Wl-Vl-Ap-Br-Cl-Eu Firmware, Weidmueller Ie-Wl-Vl-Ap-Br-Cl-Us Firmware, Weidmueller Ie-Wlt-Bl-Ap-Cl-Eu Firmware, Weidmueller Ie-Wlt-Bl-Ap-Cl-Us Firmware and 2 more.

How do I fix CVE-2021-33535?

No fix has been published for CVE-2021-33535 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-33535 being exploited?

There is no known exploitation of CVE-2021-33535 in the wild and no public exploit code.

Sources

Also known as GHSA-79h3-q6m5-2593.