CVE-2021-33536 WEIDMUELLER: WLAN devices affected by Denial-of-Service vulnerability

High 7.5 Published 25 Jun 2021 Updated 17 Sep 2024

An unauthenticated attacker can cause a denial of service in Weidmüller Industrial WLAN devices by sending a specially crafted packet that triggers an integer underflow and memory access violation.

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

What is CVE-2021-33536?

CVE-2021-33536 is a high-severity vulnerability in Weidmüller IE-WL(T)-BL-AP-CL-XX, published on 25 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Weidmueller Industrial WLAN devices in multiple versions an exploitable denial-of-service vulnerability exists in ServiceAgent functionality. A specially crafted packet can cause an integer underflow, triggering a large memcpy that will access unmapped or out-of-bounds memory. An attacker can send this packet while unauthenticated to trigger this vulnerability.

Weakness: CWE-191

Which versions are affected by CVE-2021-33536?

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-2021-33536?

No fix has been published for CVE-2021-33536 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-33536 being exploited?

There is no known exploitation of CVE-2021-33536 in the wild and no public exploit code.

Sources

Also known as GHSA-32vx-68rr-3qv3.