CVE-2021-33537 : Vulnerability Insights and Analysis

This CVE-2021-33537 article provides detailed information about the Remote Code Execution (RCE) vulnerability affecting Weidmueller Industrial WLAN devices. Learn about the vulnerability, its impact, technical details, and mitigation steps.

Understanding CVE-2021-33537

In Weidmueller Industrial WLAN devices in multiple versions, an exploitable remote code execution vulnerability exists in the iw_webs configuration parsing functionality.

What is CVE-2021-33537?

An attacker can exploit a specially crafted user name entry, causing an overflow of an error message buffer that leads to remote code execution, even when authenticated as a low privilege user.

The Impact of CVE-2021-33537

The vulnerability has a CVSS base score of 8.8 (High severity), with low attack complexity, requiring network access, and resulting in high confidentiality, integrity, and availability impact.

Technical Details of CVE-2021-33537

Vulnerability Description

The vulnerability allows remote code execution in Weidmueller Industrial WLAN devices by overflowing an error message buffer via a crafted user name entry.

Affected Systems and Versions

Impacted products include IE-WL(T)-BL-AP-CL-XX and IE-WL(T)-VL-AP-CL-XX versions with specific build details.

Exploitation Mechanism

Attackers can remotely execute malicious code by exploiting a buffer overflow in the iw_webs configuration parsing function of affected devices.

Mitigation and Prevention

Immediate Steps to Take

Users are advised to update their systems to fixed versions for both IE-WL(T)-BL-AP-CL-XX and IE-WL(T)-VL-AP-CL-XX.

Long-Term Security Practices

Regularly update and patch Weidmueller Industrial WLAN devices to prevent vulnerabilities and secure network infrastructure.

Patching and Updates

The vendor, Weidmüller, has released fixed versions: V1.16.21 (Build 21010513) for IE-WL(T)-BL-AP-CL-XX and V1.11.13 (Build 21010513) for IE-WL(T)-VL-AP-CL-XX.