CVE-2021-34730 : What You Need to Know

A vulnerability in the Universal Plug-and-Play (UPnP) service of Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers could allow an unauthenticated, remote attacker to execute arbitrary code or cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to improper validation of incoming UPnP traffic.

Understanding CVE-2021-34730

This section will provide an in-depth look into the CVE-2021-34730 vulnerability.

What is CVE-2021-34730?

The vulnerability in the Universal Plug-and-Play (UPnP) service of certain Cisco routers allows remote attackers to execute arbitrary code or trigger unexpected device restarts, leading to a denial of service.

The Impact of CVE-2021-34730

The critical vulnerability poses a high risk as attackers could potentially gain root access to the underlying operating system, leading to complete control or causing devices to reload, resulting in a significant disruption of service.

Technical Details of CVE-2021-34730

This section will delve into the technical aspects of the CVE-2021-34730 vulnerability.

Vulnerability Description

The vulnerability arises due to the lack of proper validation of incoming UPnP traffic, enabling attackers to craft malicious UPnP requests to exploit the affected devices.

Affected Systems and Versions

Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers are impacted by this vulnerability, with the UPnP service being the focal point of exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted UPnP requests to the vulnerable devices, allowing the execution of arbitrary code or triggering a device restart.

Mitigation and Prevention

In this section, we will discuss the steps to mitigate and prevent the CVE-2021-34730 vulnerability.

Immediate Steps to Take

Until a patch is released, users are advised to disable UPnP on the affected Cisco routers to prevent exploitation of this critical vulnerability.

Long-Term Security Practices

Implementing network segmentation, access controls, and regular security updates can enhance the overall security posture of the network infrastructure.

Patching and Updates

Cisco has yet to release software updates addressing CVE-2021-34730. Users are urged to closely monitor official channels for the availability of patches and apply them promptly upon release.