CVE-2022-20728

What it is

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.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. Limited direct impact.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2022-09-30 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 04:24 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.3% in the next 30 days (EPSS).
• Severity: 4.7 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2022-09-30 19:15 UTC

Last modified

2026-06-17 04:24 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-284 · Improper access control

Record status

Modified

Affected

• Cisco Aironet 1542d Firmware 017.006\(001\)
• Cisco Aironet 1542i Firmware 017.006\(001\)
• Cisco Aironet 1562i Firmware 017.006\(001\)
• Cisco Aironet 1562e Firmware 017.006\(001\)
• Cisco Aironet 1562d Firmware 017.006\(001\)
• Cisco Aironet 1815i Firmware 017.006\(001\)
• Cisco Aironet 1815m Firmware 017.006\(001\)
• Cisco Aironet 1815t Firmware 017.006\(001\)

Attack profile CVSS 3.1 · 4.7

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2022-20728.md and follow it. Check whether this project is affected by CVE-2022-20728. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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