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CVE-2021-33539

WEIDMUELLER: WLAN devices affected by authentication bypass vulnerability

High7.2EPSS 1.1%
Published
Updated
Reserved
Assigned by
CERTVDE

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.

Timeline

  1. ID reserved

    By CERTVDE

  2. · 32 days later

    Published

  3. · 3 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-33539, by who scored it
Scored byCVSSScoreVector
CERTVDECNA (assigner)3.1High7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High7.2CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
1.1% · top 35% of all CVEs (7 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.

Weakness

Affected products

  • Weidmüller · IE-WL(T)-BL-AP-CL-XX

    • affected IE-WL-BL-AP-CL-EU (2536600000) – ≤ V1.16.18 (Build 18081617)
    • affected IE-WLT-BL-AP-CL-EU (2536650000) – ≤ V1.16.18 (Build 18081617)
    • affected IE-WL-BL-AP-CL-US (2536660000) – ≤ V1.16.18 (Build 18081617)
    • affected IE-WLT-BL-AP-CL-US (2536670000) – ≤ V1.16.18 (Build 18081617)

  • Weidmüller · IE-WL(T)-VL-AP-CL-XX

    • affected IE-WL-VL-AP-BR-CL-EU (2536680000) – ≤ V1.11.10 (Build 18122616)
    • affected IE-WLT-VL-AP-BR-CL-EU (2536690000) – ≤ V1.11.10 (Build 18122616)
    • affected IE-WL-VL-AP-BR-CL-US (2536700000) – ≤ V1.11.10 (Build 18122616)
    • affected IE-WLT-VL-AP-BR-CL-US (2536710000) – ≤ V1.11.10 (Build 18122616)

What to do

Solution: For IE-WL(T)-BL-AP-CL-XX versions V1.16.21 (Build 21010513) and greater are fixed. For IE-WL(T)-VL-AP-CL-XX versions V1.11.13 (Build 21010513) and greater are fixed.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .