CVE-2021-33537 WEIDMUELLER: WLAN devices affected by Remote Code Execution (RCE) vulnerability

High 8.8 Published 25 Jun 2021 Updated 17 Sep 2024

A buffer overflow in Weidmüller Industrial WLAN devices allows authenticated low-privilege users to execute arbitrary code via crafted username entries.

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-2021-33537?

CVE-2021-33537 is a high-severity memory corruption 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 remote code execution vulnerability exists in the iw_webs configuration parsing functionality. A specially crafted user name entry can cause an overflow of an error message buffer, resulting in remote code execution. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

Weakness: CWE-120

Which versions are affected by CVE-2021-33537?

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-2021-33537?

No fix has been published for CVE-2021-33537 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-33537 being exploited?

There is no known exploitation of CVE-2021-33537 in the wild and no public exploit code.

Sources

Also known as GHSA-j5r6-wf58-2j94.