CVE-2021-40406 Explained : Impact and Mitigation

This CVE-2021-40406 article provides details about a denial of service vulnerability in the cgiserver.cgi session creation functionality of Reolink RLC-410W v3.0.0.136_20121102, impacting users' ability to log in.

Understanding CVE-2021-40406

This section delves into the specifics of CVE-2021-40406.

What is CVE-2021-40406?

A denial of service vulnerability in the cgiserver.cgi session creation of Reolink RLC-410W v3.0.0.136_20121102 allows attackers to disrupt user login by sending a crafted HTTP request.

The Impact of CVE-2021-40406

The vulnerability's CVSS base score is 7.5 (High), posing a significant risk to availability, with a specific vector indicating a network-based attack.

Technical Details of CVE-2021-40406

This section elaborates on the technical aspects of CVE-2021-40406.

Vulnerability Description

CWE-400 (Uncontrolled Resource Consumption) describes the issue as a denial of service vulnerability in Reolink RLC-410W v3.0.0.136_20121102.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Affected Version: v3.0.0.136_20121102

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Scope: Unchanged
Impact: High

Mitigation and Prevention

In this section, we outline mitigation strategies for CVE-2021-40406.

Immediate Steps to Take

Implement network-level protections to filter out malicious HTTP requests.
Monitor network traffic for any unusual patterns that could indicate exploitation attempts.

Long-Term Security Practices

Regularly update the firmware to patch known vulnerabilities.
Conduct security assessments to identify and mitigate potential security gaps.

Patching and Updates

Stay informed about security updates provided by Reolink for the RLC-410W camera model.