CVE-2018-21155 : What You Need to Know

NETGEAR devices are vulnerable to stored XSS, affecting various models such as D7800, DM200, R6100, R7500, R7500v2, R7800, R8900, R9000, WNDR4300, WNDR4300v2, WNDR4500v3, and WNR2000v5.

Understanding CVE-2018-21155

This CVE identifies a stored cross-site scripting vulnerability in multiple NETGEAR devices.

What is CVE-2018-21155?

Stored XSS vulnerability impacting several NETGEAR router models, potentially allowing attackers to execute malicious scripts.

The Impact of CVE-2018-21155

The vulnerability has a CVSS base score of 6.3 (Medium severity) and requires user interaction for exploitation, with low impacts on confidentiality, integrity, and availability.

Technical Details of CVE-2018-21155

Stored XSS vulnerability details and affected systems.

Vulnerability Description

Stored XSS vulnerability in NETGEAR devices allows attackers to inject malicious scripts into web pages viewed by users.

Affected Systems and Versions

D7800 (version prior to 1.0.1.34)
DM200 (version prior to 1.0.0.52)
R6100 (version prior to 1.0.1.22)
R7500 (version prior to 1.0.0.122)
R7500v2 (version prior to 1.0.3.26)
R7800 (version prior to 1.0.2.42)
R8900 (version prior to 1.0.4.2)
R9000 (version prior to 1.0.3.16)
WNDR4300 (version prior to 1.0.2.98)
WNDR4300v2 (version prior to 1.0.0.54)
WNDR4500v3 (version prior to 1.0.0.54)
WNR2000v5 (version prior to 1.0.0.64)

Exploitation Mechanism

Attackers can exploit this vulnerability by tricking users into clicking on specially crafted links or visiting malicious websites.

Mitigation and Prevention

Steps to mitigate and prevent the CVE-2018-21155 vulnerability.

Immediate Steps to Take

Update affected NETGEAR devices to the latest firmware versions.
Avoid clicking on suspicious links or visiting untrusted websites.
Regularly monitor NETGEAR's security advisories for updates.

Long-Term Security Practices

Implement network segmentation to limit the impact of potential attacks.
Educate users about safe browsing practices and the risks of clicking on unknown links.

Patching and Updates

NETGEAR regularly releases firmware updates to address security vulnerabilities; ensure devices are promptly updated.