CVE-2021-20864 : Exploit Details and Defense Strategies

A detailed overview of CVE-2021-20864 affecting ELECOM routers, highlighting the vulnerability, impact, technical details, and mitigation methods.

Understanding CVE-2021-20864

This section delves into the specifics of the vulnerability found in ELECOM routers.

What is CVE-2021-20864?

The CVE-2021-20864 involves an improper access control vulnerability in ELECOM routers, allowing an unauthenticated attacker to bypass access restrictions and execute arbitrary OS commands.

The Impact of CVE-2021-20864

The vulnerability poses a significant security risk as it enables attackers to start the telnet service and run malicious commands through unspecified vectors.

Technical Details of CVE-2021-20864

This section outlines the technical aspects of the CVE-2021-20864 vulnerability.

Vulnerability Description

The vulnerability allows network-adjacent unauthenticated attackers to circumvent access controls, potentially leading to unauthorized OS command execution.

Affected Systems and Versions

ELECOM routers, including models like WRC-1167GST2, WRC-2533GS2-B, WRC-1750GS, and more, are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by bypassing access restrictions, initiating the telnet service, and executing malicious OS commands via unspecified vectors.

Mitigation and Prevention

This section offers guidance on how to mitigate the CVE-2021-20864 vulnerability.

Immediate Steps to Take

Users are advised to apply security patches promptly, restrict network access to vulnerable devices, and monitor for any suspicious activity.

Long-Term Security Practices

Implementing network segmentation, using strong authentication methods, and conducting regular security audits can enhance long-term security.

Patching and Updates

Regularly check for firmware updates from ELECOM, apply patches as soon as they are available, and follow secure configuration practices to reduce the risk of exploitation.