CVE-2021-20855 : What You Need to Know

A cross-site scripting vulnerability in ELECOM LAN routers allows a remote authenticated attacker to inject arbitrary scripts. Learn about the impact, technical details, and mitigation steps for CVE-2021-20855.

Understanding CVE-2021-20855

This section provides insights into the CVE-2021-20855 vulnerability affecting ELECOM LAN routers.

What is CVE-2021-20855?

CVE-2021-20855 is a cross-site scripting vulnerability found in ELECOM LAN routers, specifically in WRH-733GBK firmware v1.02.9 and prior, and WRH-733GWH firmware v1.02.9 and prior. This vulnerability enables a remote authenticated attacker to inject arbitrary scripts using unspecified vectors.

The Impact of CVE-2021-20855

With this vulnerability, a malicious actor can execute scripts on the victim's browser, leading to unauthorized actions, data theft, or phishing attacks. It poses a significant risk to the security and integrity of the affected devices and networks.

Technical Details of CVE-2021-20855

Explore the technical aspects of CVE-2021-20855, including vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability allows a remote authenticated attacker to inject malicious scripts into the ELECOM LAN routers, compromising their security and enabling unauthorized actions.

Affected Systems and Versions

ELECOM LAN routers with WRH-733GBK firmware v1.02.9 and earlier, as well as WRH-733GWH firmware v1.02.9 and earlier, are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts through unspecified vectors after authenticating remotely on the affected routers.

Mitigation and Prevention

Discover the essential steps to mitigate the risks associated with CVE-2021-20855 and prevent further exploitation.

Immediate Steps to Take

Users are advised to update their ELECOM LAN routers to the latest firmware version provided by the vendor. Furthermore, it is crucial to monitor network activities for any suspicious behavior.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security assessments, and educating users on safe browsing habits can help prevent XSS attacks and enhance overall network security.

Patching and Updates

Stay informed about security advisories from ELECOM CO.,LTD., and promptly apply patches and updates to address known vulnerabilities and enhance the security posture of ELECOM LAN routers.