CVE-2021-44355 : What You Need to Know

A denial of service vulnerability in Reolink RLC-410W v3.0.0.136_20121102 allows for a reboot via a crafted HTTP request.

Understanding CVE-2021-44355

This CVE involves multiple denial of service vulnerabilities in the cgiserver.cgi JSON command parser functionality of Reolink RLC-410W.

What is CVE-2021-44355?

The CVE-2021-44355 vulnerability enables attackers to cause a denial of service leading to a system reboot by sending a specially-crafted HTTP request.

The Impact of CVE-2021-44355

The vulnerability has a CVSS base score of 8.6 (High), with a high availability impact. Attackers can exploit this issue without needing any special privileges.

Technical Details of CVE-2021-44355

This section covers the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability stems from improper input validation in the JSON command parser of the affected Reolink product and version.

Affected Systems and Versions

Affected Product: Reolink RLC-410W
Affected Version: v3.0.0.136_20121102

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Privileges Required: None
User Interaction: None
Scope: Changed
Vector String: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Mitigation and Prevention

To address CVE-2021-44355, follow these steps:

Immediate Steps to Take

Implement network segmentation to limit access
Regularly monitor for unusual network traffic
Apply vendor-supplied patches or updates promptly

Long-Term Security Practices

Enhance firewall rules to filter and block malicious traffic
Conduct regular security assessments and audits
Educate users on safe browsing practices

Patching and Updates

Keep software up to date with the latest security patches
Continuously monitor vendor announcements for security fixes