CVE-2018-21156 Explained : Impact and Mitigation

NETGEAR devices are vulnerable to a buffer overflow issue that can be exploited by an authorized user. Multiple models are affected, including D6220, D6400, D7000v2, D8500, and more.

Understanding CVE-2018-21156

This CVE identifies a buffer overflow vulnerability in various NETGEAR devices, potentially allowing an authenticated user to execute arbitrary code.

What is CVE-2018-21156?

The CVE-2018-21156 vulnerability involves a buffer overflow in NETGEAR devices, enabling an attacker to trigger the flaw through a crafted request, leading to potential code execution.

The Impact of CVE-2018-21156

The vulnerability has a CVSS base score of 6.8, indicating a medium severity issue with high impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2018-21156

This section provides more in-depth technical insights into the CVE-2018-21156 vulnerability.

Vulnerability Description

The buffer overflow vulnerability in NETGEAR devices allows an authenticated user to potentially execute arbitrary code by sending specially crafted requests.

Affected Systems and Versions

The following NETGEAR models are impacted by CVE-2018-21156:

D6220 (before 1.0.0.38)
D6400 (before 1.0.0.74)
D7000v2 (before 1.0.0.74)
D8500 (before 1.0.3.39)
And more (refer to the provided list).

Exploitation Mechanism

The vulnerability can be exploited by an authenticated user sending malicious requests to the affected NETGEAR devices, potentially leading to unauthorized code execution.

Mitigation and Prevention

To address CVE-2018-21156 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Apply security patches provided by NETGEAR for the affected devices.
Monitor network traffic for any suspicious activities that could indicate exploitation attempts.
Restrict access to vulnerable devices to authorized personnel only.

Long-Term Security Practices

Regularly update firmware and software to ensure the latest security fixes are in place.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories from NETGEAR and promptly apply recommended patches to mitigate known vulnerabilities.