medium
4.7
CWE
284
Advisory Published
Updated

CVE-2022-20728: Cisco Access Points VLAN Bypass from Native VLAN Vulnerability

First published: Fri Sep 30 2022(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Aironet 1542d Firmware=017.006\(001\)
Cisco Aironet 1542d
Cisco Aironet 1542i Firmware=017.006\(001\)
Cisco Aironet 1542i
Cisco Aironet 1562i Firmware=017.006\(001\)
Cisco Aironet 1562i
Cisco Aironet 1562e Firmware=017.006\(001\)
Cisco Aironet 1562e
Cisco Aironet 1562d Firmware=017.006\(001\)
Cisco Aironet 1562d
Cisco Aironet 1815i Firmware=017.006\(001\)
Cisco Aironet 1815i
Cisco Aironet 1815m Firmware=017.006\(001\)
Cisco Aironet 1815m
Cisco Aironet 1815t Firmware=017.006\(001\)
Cisco Aironet 1815t
Cisco Aironet 1815w Firmware=017.006\(001\)
Cisco Aironet 1815w
Cisco Aironet 1830 Firmware=017.006\(001\)
Cisco Aironet 1830
Cisco Aironet 1840 Firmware=017.006\(001\)
Cisco Aironet 1840
Cisco Aironet 1850e Firmware=017.006\(001\)
Cisco Aironet 1850e
Cisco Aironet 1850i Firmware=017.006\(001\)
Cisco Aironet 1850i
Cisco Aironet 2800i Firmware=017.006\(001\)
Cisco Aironet 2800i
Cisco Aironet 2800e Firmware=017.006\(001\)
Cisco Aironet 2800e
Cisco Aironet 3800i Firmware=017.006\(001\)
Cisco Aironet 3800i
Cisco Aironet 3800e Firmware=017.006\(001\)
Cisco Aironet 3800e
Cisco Aironet 3800p Firmware=017.006\(001\)
Cisco Aironet 3800p
Cisco Aironet 4800 Firmware=017.006\(001\)
Cisco Aironet 4800
Cisco Catalyst 9105ax Firmware=017.006\(001\)
Cisco Catalyst 9105ax
Cisco Catalyst 9115ax Firmware=017.006\(001\)
Cisco Catalyst 9115ax
Cisco Catalyst 9117ax Firmware=017.006\(001\)
Cisco Catalyst 9117ax
Cisco Catalyst 9120ax Firmware=017.006\(001\)
Cisco Catalyst 9120ax
Cisco Catalyst 9124ax Firmware=017.006\(001\)
Cisco Catalyst 9124ax
Cisco Catalyst 9130ax Firmware=017.006\(001\)
Cisco Catalyst 9130ax
Cisco Catalyst Iw6300 Firmware=017.006\(001\)
Cisco Catalyst Iw6300

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Reference Links

Frequently Asked Questions

  • What is CVE-2022-20728?

    CVE-2022-20728 is a vulnerability in the client forwarding code of multiple Cisco Access Points (APs) that allows an unauthenticated, adjacent attacker to inject packets from the native VLAN to clients within nonnative VLANs.

  • How does CVE-2022-20728 affect Cisco Access Points?

    CVE-2022-20728 affects multiple Cisco Access Points (APs) by allowing an attacker to inject packets from the native VLAN to clients within nonnative VLANs.

  • What is the severity of CVE-2022-20728?

    CVE-2022-20728 has a severity rating of 4.7 out of 10, which is considered medium severity.

  • How can I fix CVE-2022-20728?

    To fix CVE-2022-20728, Cisco has released a software update. Please refer to the Cisco Security Advisory for specific instructions.

  • Where can I find more information about CVE-2022-20728?

    You can find more information about CVE-2022-20728 in the Cisco Security Advisory.

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