CVE-2021-1335 : What You Need to Know

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV Series Routers could allow an authenticated attacker to execute arbitrary code or trigger an unexpected device restart. These vulnerabilities are a result of improper input validation, potentially leading to remote command execution and denial of service.

Understanding CVE-2021-1335

This CVE involves security flaws in the web-based management interface of Cisco Small Business RV Series Routers, opening up possibilities for unauthorized code execution or device disruptions.

What is CVE-2021-1335?

The vulnerability stems from inadequate validation of user-supplied input on the router's web-based management interface, enabling attackers to launch crafted HTTP requests and gain root access to execute malicious code or disrupt device functioning.

The Impact of CVE-2021-1335

Successful exploitation can lead to severe consequences, including unauthorized code execution, device reloads, and denial of service conditions, posing a significant threat to the affected systems.

Technical Details of CVE-2021-1335

This section delves deeper into the specifics of the CVE, outlining the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability allows remote authenticated attackers to execute arbitrary code or cause device reloads due to improper input validation in the web-based management interface.

Affected Systems and Versions

Cisco Small Business RV016, RV042, RV042G, RV082, RV320, and RV325 Routers are impacted by this vulnerability with the firmware versions affected not specified.

Exploitation Mechanism

Attackers with valid administrator credentials can exploit these vulnerabilities by sending crafted HTTP requests to the affected devices, potentially resulting in the execution of unauthorized code or device restarts.

Mitigation and Prevention

In this section, we discuss the immediate steps to take and long-term security practices to safeguard against CVE-2021-1335.

Immediate Steps to Take

Immediately update the firmware of the affected routers to the latest version provided by Cisco to mitigate the risk of exploitation. Ensure that only authorized personnel have access to the router's administrative credentials.

Long-Term Security Practices

Regularly monitor for security advisories from Cisco and apply necessary patches promptly. Implement network segmentation and access control measures to restrict unauthorized access to critical infrastructure.

Patching and Updates

Stay informed about firmware updates and security alerts from Cisco to address known vulnerabilities promptly. Regularly review and update access control policies and ensure secure configuration practices are maintained.