CVE-2021-20856 Explained : Impact and Mitigation

A cross-site scripting vulnerability in ELECOM LAN routers has been identified, potentially impacting devices with WRH-733GBK firmware v1.02.9 and prior, as well as WRH-733GWH firmware v1.02.9 and prior. This CVE allows a remote authenticated attacker to inject arbitrary scripts through unspecified vectors.

Understanding CVE-2021-20856

This section provides detailed insights into the CVE-2021-20856 vulnerability.

What is CVE-2021-20856?

The CVE-2021-20856 refers to a cross-site scripting vulnerability in ELECOM LAN routers, enabling attackers to inject malicious scripts remotely.

The Impact of CVE-2021-20856

The vulnerability can be exploited by a remote authenticated attacker to execute arbitrary scripts on affected routers, potentially leading to various security risks.

Technical Details of CVE-2021-20856

Explore the technical specifics related to CVE-2021-20856 below.

Vulnerability Description

The CVE-2021-20856 vulnerability allows attackers to perform cross-site scripting attacks on ELECOM LAN routers.

Affected Systems and Versions

Devices using WRH-733GBK firmware v1.02.9 and prior, as well as WRH-733GWH firmware v1.02.9 and prior, are vulnerable to CVE-2021-20856.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting and executing malicious scripts on affected ELECOM LAN routers.

Mitigation and Prevention

Learn about the steps to mitigate and prevent CVE-2021-20856 below.

Immediate Steps to Take

It is recommended to apply security patches provided by ELECOM CO.,LTD. promptly to address the CVE-2021-20856 vulnerability.

Long-Term Security Practices

Implementing network segmentation, keeping software updated, and conducting regular security audits can enhance the overall security posture.

Patching and Updates

Stay informed about security updates released by ELECOM CO.,LTD. for the affected router models to prevent exploitation of CVE-2021-20856.