CVE-2021-40120 : What You Need to Know

This article discusses the Command Injection Vulnerability in Cisco Small Business RV Series Routers.

Understanding CVE-2021-40120

This section provides insights into the technical details and impact of the CVE.

What is CVE-2021-40120?

CVE-2021-40120 is a vulnerability found in the web-based management interface of certain Cisco Small Business RV Series Routers. It could allow an authenticated remote attacker with admin privileges to inject commands into the underlying OS.

The Impact of CVE-2021-40120

The vulnerability could enable attackers to execute arbitrary commands on the Linux OS with root-level privileges. No public announcements or malicious use have been reported.

Technical Details of CVE-2021-40120

This section delves into the specific technical aspects of the vulnerability.

Vulnerability Description

The flaw arises from insufficient validation of user inputs in the router's web interface, allowing the injection of arbitrary commands.

Affected Systems and Versions

Affected Product: Cisco Small Business RV Series Router Firmware
Vendor: Cisco
Affected Version: n/a

Exploitation Mechanism

Attackers with admin privileges can exploit the vulnerability by injecting malicious input into a specific web interface field.

Mitigation and Prevention

Learn about the necessary steps to mitigate and prevent potential attacks.

Immediate Steps to Take

Apply patches and updates provided by Cisco.
Restrict network access to the management interface of the routers.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update router firmware and security configurations.
Conduct security audits and penetration testing on the network infrastructure.
Keep abreast of security advisories and best practices.

Patching and Updates

Cisco has released patches to address the vulnerability in the affected router firmware.