CVE-2021-40416 Explained : Impact and Mitigation

This CVE-2021-40416 article provides an overview of an incorrect default permission vulnerability in the cgiserver.cgi cgi_check_ability functionality of reolink RLC-410W v3.0.0.136_20121102.

Understanding CVE-2021-40416

CVE-2021-40416 is a vulnerability identified in the cgiserver.cgi cgi_check_ability function of reolink RLC-410W v3.0.0.136_20121102.

What is CVE-2021-40416?

The vulnerability allows any logged-in user to execute all Get APIs that are not included in cgi_check_ability. An attacker can exploit this flaw by sending an HTTP request.

The Impact of CVE-2021-40416

The vulnerability has a CVSS base score of 7.1, categorizing it as high severity. The impact includes high availability impact and low integrity impact, with low privileges required for exploitation.

Technical Details of CVE-2021-40416

This section provides in-depth technical details of the vulnerability.

Vulnerability Description

The vulnerability stems from incorrect default permissions in the cgi_check_ability function, allowing unauthorized access to certain APIs.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions Affected: RLC-410W v3.0.0.136_20121102

Exploitation Mechanism

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

Mitigation and Prevention

Protecting systems from CVE-2021-40416 requires immediate action and long-term security practices.

Immediate Steps to Take

Implement access controls to restrict API execution.
Monitor HTTP requests for suspicious activity.

Long-Term Security Practices

Regularly audit and update permissions.
Conduct security training for users on best practices.

Patching and Updates

Apply patches provided by the vendor to fix the vulnerability.