CVE-2022-20891 Explained : Impact and Mitigation

Multiple vulnerabilities in the web-based management interface of Cisco Small Business RV Series Router Firmware could allow a remote attacker to execute arbitrary code or cause denial of service. Find out more about CVE-2022-20891 and how to protect your devices.

Understanding CVE-2022-20891

This CVE involves multiple vulnerabilities in the Cisco Small Business RV Series Router Firmware that could be exploited by an authenticated, remote attacker to gain root-level access or disrupt device operation.

What is CVE-2022-20891?

The vulnerabilities in Cisco Small Business RV series routers stem from inadequate validation of user fields within incoming HTTP packets. An attacker with valid Administrator credentials could send specially-crafted requests to the web-based management interface to execute arbitrary commands, potentially leading to a denial of service.

The Impact of CVE-2022-20891

A successful exploit of these vulnerabilities could allow the attacker to execute arbitrary code on affected devices with elevated privileges or cause them to restart unexpectedly, resulting in a denial of service condition. As of the advisory date, Cisco had not released software updates to address these vulnerabilities.

Technical Details of CVE-2022-20891

Let's delve into the specifics of this CVE to better understand the vulnerability, affected systems, and exploitation mechanisms.

Vulnerability Description

The vulnerabilities in the web-based management interface of Cisco Small Business RV Series Router Firmware allow remote attackers to execute arbitrary commands with root privileges or trigger denial of service conditions via crafted HTTP requests.

Affected Systems and Versions

The vulnerabilities impact Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers running the affected firmware versions. All versions are susceptible to exploitation.

Exploitation Mechanism

By sending specially-crafted requests to the web-based management interface of the routers, attackers with valid Administrator credentials can exploit the vulnerabilities to execute arbitrary code or disrupt device operations.

Mitigation and Prevention

To safeguard your devices from CVE-2022-20891, immediate actions and long-term security practices are recommended, along with keeping an eye out for future patches and updates.

Immediate Steps to Take

Ensure that access to the web-based management interface of affected devices is restricted, and monitor for any unusual or unauthorized activities. Consider implementing network segmentation and access controls.

Long-Term Security Practices

Regularly update firmware on all network devices, including routers, to patch known vulnerabilities and enhance overall security posture. Conduct security assessments and audits periodically to identify and address any potential weaknesses.

Patching and Updates

Keep track of security advisories from Cisco and promptly apply any patches or updates released to address the vulnerabilities in the Small Business RV Series Router Firmware.