---
id: CVE-2022-20728
title: Cisco Aironet Access Points VLAN bypass from Native VLAN Vulnerability
summary: "A vulnerability in the client forwarding code of multiple Cisco Access Points (APs) could allow an unauthenticated, adjacent attacker to inject packets from the native VLAN to clients within nonnative VLANs on an affected device.\r\n\r\nThis v…"
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'
cvssSource: vendor
vendor: Cisco
product: Cisco Aironet Access Point Software (IOS XE Controller)
affected:
  - aironet_access_point_software_ios_xe_controller
published: '2022-09-27'
updated: '2022-10-04'
sourceUpdated: '2022-10-04T13:22:46+00:00'
source: CSAF
sourceUrl: >-
  https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
references:
  - url: >-
      https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
  - url: 'https://software.cisco.com'
tags:
  - csaf
  - vendor-advisory
  - cisco
epss: 0.00258
epssPercentile: 0.17746
ingestedAt: '2026-09-08T15:58:18.543Z'
---

## Overview

A vulnerability in the client forwarding code of multiple Cisco Access Points (APs) could allow an unauthenticated, adjacent attacker to inject packets from the native VLAN to clients within nonnative VLANs on an affected device.

This vulnerability is due to a logic error on the AP that forwards packets that are destined to a wireless client if they are received on the native VLAN. An attacker could exploit this vulnerability by obtaining access to the native VLAN and directing traffic directly to the client through their MAC/IP combination. A successful exploit could allow the attacker to bypass VLAN separation and potentially also bypass any Layer 3 protection mechanisms that are deployed.

Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

## Vendor advisories

- **cisco-sa-apvlan-TDTtb4FY** · Cisco · affected: Cisco Aironet Access Point Software (IOS XE Controller) · updated 2022-10-04 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY)

**Cisco Access Points VLAN Bypass from Native VLAN Vulnerability**. Released 2022-09-27, updated 2022-10-04.

Affected:

- Cisco Aironet Access Point Software (IOS XE Controller)

## Remediation

Cisco has released software updates that address this vulnerability. https://software.cisco.com