CVE-2021-33539
WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability
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.
- Record
CVE-2021-33539- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-287
- Updated
- 2026-11-02
EUVDEUVD-2021-20231
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.
- Record
EUVD-2021-20231- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-9vqf-5jhj-hm4w No score
In Weidmueller Industrial WLAN devices in multiple versions an exploitable authentication bypass...
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.
- Record
GHSA-9vqf-5jhj-hm4w- Weakness
- CWE-287
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-33539- CVSS 3.1
- 7.2 High
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Weakness
- CWE-287
- Updated
- 2026-11-02
Affected products
- 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
- weidmueller ie-wlt-vl-ap-br-cl-eu firmware
- weidmueller ie-wlt-vl-ap-br-cl-us firmware
- weidmüller ie-wl(t)-bl-ap-cl-xx
- weidmüller ie-wl(t)-vl-ap-cl-xx
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-33539 is a high vulnerability (CVSS 7.2) in Weidmueller Ie-wl-bl-ap-cl-eu Firmware, published June 25, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.06%, the 64th percentile. No source names a fixed version.