CVE-2022-20728 : Security Advisory and Response

A vulnerability in the client forwarding code of multiple Cisco Access Points could allow an unauthenticated attacker to inject packets from the native VLAN to clients within nonnative VLANs, potentially bypassing VLAN separation.

Understanding CVE-2022-20728

This CVE describes a vulnerability in Cisco Access Points that could be exploited by an adjacent attacker.

What is CVE-2022-20728?

The vulnerability allows an unauthenticated attacker to inject packets from the native VLAN to clients within nonnative VLANs due to a logic error in the client forwarding code of affected Cisco Access Points.

The Impact of CVE-2022-20728

If successfully exploited, the attacker could bypass VLAN separation and potentially evade Layer 3 protection mechanisms on the affected device.

Technical Details of CVE-2022-20728

This section delves into the specifics of the vulnerability.

Vulnerability Description

The vulnerability is caused by a logic error that forwards packets destined for wireless clients from the native VLAN to nonnative VLANs.

Affected Systems and Versions

The vulnerability affects Cisco Aironet Access Point Software operating on IOS XE Controller with unspecified versions.

Exploitation Mechanism

An attacker can exploit this flaw by gaining access to the native VLAN and directing traffic to the client through their MAC/IP combination.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate action and long-term security practices.

Immediate Steps to Take

Cisco advises users to apply the necessary security updates and configurations provided by the vendor to mitigate the risk of exploitation.

Long-Term Security Practices

Implement network segmentation, access controls, and monitor VLAN traffic to enhance the overall security posture.

Patching and Updates

Regularly check for security advisories and updates from Cisco to ensure the devices are protected against known vulnerabilities.