CVE intelligence and bounded remediation

CVE-2021-33539 — Weidmueller Ie-Wl-Bl-Ap-Cl-Eu Firmware security vulnerability

High CVSS 7.2

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.

Severity
High
CVSS
7.2 (3.1)
Published
2021-06-25
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-287

Affected products

  • weidmueller / ie-wl-bl-ap-cl-eu_firmware
  • weidmueller / ie-wlt-bl-ap-cl-eu_firmware
  • weidmueller / ie-wl-bl-ap-cl-us_firmware
  • weidmueller / ie-wlt-bl-ap-cl-us_firmware
  • weidmueller / ie-wl-vl-ap-br-cl-eu_firmware
  • weidmueller / ie-wlt-vl-ap-br-cl-eu_firmware

Showing 6 representative product identities from 16 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Authentication bypass and missing authentication

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Check exposure

  • Map every affected endpoint and protocol path, including alternate ports, legacy routes, recovery flows, service accounts, and machine-to-machine access.
  • Confirm which deployments enable the affected authentication mode and whether the interface is reachable from untrusted networks.
  • Review session, token, credential, and proxy trust configuration without attempting account takeover.

Remediate safely

  • Apply the supported fix and centralize fail-closed authentication before protected request handling.
  • Remove default or embedded credentials, rotate affected secrets and sessions, and bind authentication decisions to the intended audience and channel.
  • Add negative tests for alternate routes, malformed or absent credentials, recovery flows, and proxy-derived identity.

Authoritative sources

Complete CVE record and remediation plan

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