CVE-2021-33534Network attack vector

Administrator command execution via crafted hostname

Published Jun 25, 2021 · Updated Sep 17, 2024

OS command injection in Weidmüller IE-WL(T)-BL-AP-CL and IE-WL(T)-VL-AP-BR-CL firmware allows remote authenticated users to execute commands. The hostname functionality accepts crafted network-configuration input and fails to neutralize shell metacharacters before invoking an operating-system command. High-privilege authentication is required; affected firmware is 1.16.18 and earlier for Basic Line and 1.11.10 and earlier for Value Line devices, and exploitation grants full device control.

CVSS severity7.2
High
EPSS probability2.14%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Weidmüller IE-WL(T)-BL-AP-CL and IE-WL(T)-VL-AP-BR-CL firmware allows remote authenticated users to execute commands. The hostname functionality accepts crafted network-configuration input and fails to neutralize shell metacharacters before invoking an operating-system command. High-privilege authentication is required; affected firmware is 1.16.18 and earlier for Basic Line and 1.11.10 and earlier for Value Line devices, and exploitation grants full device control.

The record

CVE
CVE-2021-33534
Published
Jun 25, 2021
Updated
Sep 17, 2024
Vendor
Weidmüller
Product
IE-WL(T)-BL-AP-CL
Classifications
CWE-78, T1059.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jun 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=IE-WL-BL-AP-CL-EU (2536600000) <=V1.16.18 (Build 18081617)
  2. Affected versionversion=IE-WL-BL-AP-CL-US (2536660000) <=V1.16.18 (Build 18081617)
  3. Affected versionversion=IE-WLT-BL-AP-CL-EU (2536650000) <=V1.16.18 (Build 18081617)
  4. Affected versionversion=IE-WLT-BL-AP-CL-US (2536670000) <=V1.16.18 (Build 18081617)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Weidmüller · IE-WL(T)-BL-AP-CLversion=IE-WL-BL-AP-CL-EU (2536600000) <=V1.16.18 (Build 18081617); version=IE-WL-BL-AP-CL-US (2536660000) <=V1.16.18 (Build 18081617); version=IE-WLT-BL-AP-CL-EU (2536650000) <=V1.16.18 (Build 18081617); version=IE-WLT-BL-AP-CL-US (2536670000) <=V1.16.18 (Build 18081617)
Weidmüller · IE-WL(T)-VL-AP-BR-CLversion=IE-WLT-VL-AP-BR-CL-EU (2536690000) <=V1.11.10 (Build 18122616); version=IE-WLT-VL-AP-BR-CL-US (2536710000) <=V1.11.10 (Build 18122616); version=IE-WL-VL-AP-BR-CL-EU (2536680000) <=V1.11.10 (Build 18122616); version=IE-WL-VL-AP-BR-CL-US (2536700000) <=V1.11.10 (Build 18122616)

Published CVSS scores

7.2CERT@VDECVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059.004Command and Scripting Interpreter: Unix Shell

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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