CVE-2021-33539

Name: CVE-2021-33539
Creator: NVD / NIST
Published: 2021-06-25T19:15:09.633+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 1.06%

Last modified Jun 17, 2026

CVE-2021-33539 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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. EPSS estimates a 1.06% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.06%

60.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Weidmueller	Ie-Wl-Bl-Ap-Cl-Eu Firmware	<= 1.16.18
Weidmueller	Ie-Wlt-Bl-Ap-Cl-Eu Firmware	<= 1.16.18
Weidmueller	Ie-Wl-Bl-Ap-Cl-Us Firmware	<= 1.16.18
Weidmueller	Ie-Wlt-Bl-Ap-Cl-Us Firmware	<= 1.16.18
Weidmueller	Ie-Wl-Vl-Ap-Br-Cl-Eu Firmware	<= 1.16.18
Weidmueller	Ie-Wlt-Vl-Ap-Br-Cl-Eu Firmware	<= 1.16.18
Weidmueller	Ie-Wl-Vl-Ap-Br-Cl-Us Firmware	<= 1.16.18
Weidmueller	Ie-Wlt-Vl-Ap-Br-Cl-Us Firmware	<= 1.16.18
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

References

https://cert.vde.com/en-us/advisories/vde-2021-026Third Party Advisory
https://cert.vde.com/en-us/advisories/vde-2021-026Third Party Advisory

Timeline

Published: Jun 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33539?

How severe is CVE-2021-33539?

CVE-2021-33539 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33539?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-33539?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST