CVE-2022-20761 Explained : Impact and Mitigation

A vulnerability has been identified in the integrated wireless access point (AP) packet processing of the Cisco 1000 Series Connected Grid Router (CGR1K). This vulnerability could allow an unauthenticated attacker to launch a denial of service attack on a targeted device by exploiting insufficient input validation.

Understanding CVE-2022-20761

This section delves into the details of the CVE-2022-20761 vulnerability, its impact, affected systems, and mitigation strategies.

What is CVE-2022-20761?

The vulnerability in the integrated wireless access point (AP) packet processing of Cisco 1000 Series Connected Grid Router (CGR1K) allows adjacent unauthenticated attackers to trigger a denial of service condition on the device. The issue stems from inadequate input validation of received traffic, enabling attackers to disrupt AP operation with crafted traffic.

The Impact of CVE-2022-20761

Exploitation of this vulnerability could result in a denial of service (DoS) situation where the integrated AP's traffic processing halts. This disruption necessitates manual reloading of the CGR1K to restore AP functionality.

Technical Details of CVE-2022-20761

Let's explore the specific technical aspects related to CVE-2022-20761, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability within the wireless AP packet processing of CGR1K arises from inadequate validation of incoming traffic. This oversight allows attackers to disrupt AP operations through carefully crafted malicious traffic.

Affected Systems and Versions

The Cisco IOS-based Cisco 1000 Series Connected Grid Router (CGR1K) is impacted by this vulnerability. As per reports, all versions are susceptible to exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specifically crafted traffic to the target device. Upon successful exploitation, the integrated AP ceases processing traffic, causing a DoS scenario.

Mitigation and Prevention

To address CVE-2022-20761, users are advised to take immediate action, adopt long-term security measures, and ensure timely patching and updates.

Immediate Steps to Take

It is crucial to apply any available vendor-provided patches or workarounds to mitigate the risk of exploitation. Additionally, network segmentation and access controls can help limit exposure.

Long-Term Security Practices

Implementing strong network monitoring, regular security assessments, and security awareness training can enhance overall security posture and readiness against potential threats.

Patching and Updates

Regularly check for security advisories from Cisco and promptly apply recommended patches and updates to safeguard systems against known vulnerabilities.