CVE-2021-20149 : Exploit Details and Defense Strategies

This CVE-2021-20149 article provides detailed information about a vulnerability in Trendnet AC2600 TEW-827DRU version 2.08B01 that lacks sufficient access controls for the WAN interface, potentially exposing all services via IPv6.

Understanding CVE-2021-20149

This section delves into what CVE-2021-20149 entails, its impact, technical details, and mitigation strategies.

What is CVE-2021-20149?

The CVE-2021-20149 vulnerability pertains to inadequate access controls for the WAN interface in Trendnet AC2600 TEW-827DRU version 2.08B01. Default iptables rules only regulate IPv4 access, leaving services accessible via IPv6.

The Impact of CVE-2021-20149

The vulnerability allows unauthorized individuals to access services on the device through the WAN interface using IPv6 by default. This could result in unauthorized access to sensitive information or system compromise.

Technical Details of CVE-2021-20149

This section elaborates on the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

Trendnet AC2600 TEW-827DRU version 2.08B01 lacks proper access controls for its WAN interface, permitting all services to be reached via IPv6 without restriction.

Affected Systems and Versions

The vulnerability affects Trendnet AC2600 TEW-827DRU routers running version 2.08B01 specifically.

Exploitation Mechanism

Malicious actors can exploit this flaw by leveraging the default configuration that allows access to all services via IPv6 on the WAN interface.

Mitigation and Prevention

This section outlines immediate steps to take and long-term security practices to mitigate the risk posed by CVE-2021-20149.

Immediate Steps to Take

Users should disable IPv6 access or configure proper access controls on the WAN interface of affected Trendnet AC2600 TEW-827DRU devices to limit unauthorized access.

Long-Term Security Practices

Regularly update firmware, monitor network traffic for suspicious activities, and implement security best practices to enhance overall cybersecurity posture.

Patching and Updates

Vendor patches or updates addressing the access control issue for the WAN interface should be promptly applied to mitigate the vulnerability effectively.