What’s Vulnerable › Vulnerabilities

CVE-2021-33539: WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability

• Severity: high (CVSS 7.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-25 · updated 2026-06-17
• Weakness: CWE-287

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.

Affected products

• Weidmueller Ie-Wl-Bl-Ap-Cl-Eu Firmware: through 1.16.18; through 1.11.10
• Weidmueller Ie-Wl-Bl-Ap-Cl-Us Firmware: through 1.16.18; through 1.11.10
• Weidmueller Ie-Wl-Vl-Ap-Br-Cl-Eu Firmware: through 1.16.18; through 1.11.10
• Weidmueller Ie-Wl-Vl-Ap-Br-Cl-Us Firmware: through 1.16.18; through 1.11.10
• Weidmueller Ie-Wlt-Bl-Ap-Cl-Eu Firmware: through 1.16.18; through v1.11.10
• Weidmueller Ie-Wlt-Bl-Ap-Cl-Us Firmware: through 1.16.18; through 1.11.10
• Weidmueller Ie-Wlt-Vl-Ap-Br-Cl-Eu Firmware: through 1.16.18; through 1.11.10
• Weidmueller Ie-Wlt-Vl-Ap-Br-Cl-Us Firmware: through 1.16.18; through 1.11.10

References

• https://cert.vde.com/en-us/advisories/vde-2021-026
• https://cert.vde.com/en-us/advisories/vde-2021-026

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