CVE-2021-33537: Weidmueller Ie-Wl-Bl-Ap-Cl-Eu Firmware

High severity, CVSS 8.8. EPSS: 1.6% chance of exploitation in the next 30 days.

In Weidmueller Industrial WLAN devices in multiple versions an exploitable remote code execution vulnerability exists in the iw_webs configuration parsing functionality. A specially crafted user name entry can cause an overflow of an error message buffer, resulting in remote code execution. An attacker can send commands while authenticated as a low privilege user to trigger this vulnerability.

Affected products

• Weidmueller Ie-Wl-Bl-Ap-Cl-Eu Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wl-Bl-Ap-Cl-Us Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wl-Vl-Ap-Br-Cl-Eu Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wl-Vl-Ap-Br-Cl-Us Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wlt-Bl-Ap-Cl-Eu Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wlt-Bl-Ap-Cl-Us Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wlt-Vl-Ap-Br-Cl-Eu Firmware: up to and including 1.16.18; up to and including 1.11.10
• Weidmueller Ie-Wlt-Vl-Ap-Br-Cl-Us Firmware: up to and including 1.16.18; up to and including 1.11.10

Published 2021-06-25. Last modified 2026-06-17.