CVE-2022-20728 Cisco Access Points VLAN Bypass from Native VLAN Vulnerability
An adjacent attacker can bypass VLAN separation and Layer 3 protections by injecting packets from the native VLAN to clients in other VLANs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-20728?
CVE-2022-20728 is a medium-severity vulnerability in Cisco Aironet Access Point Software (IOS XE Controller), published on 30 Sep 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-284
Which versions are affected by CVE-2022-20728?
It affects 26 products.
Products include Cisco Aironet 1542d Firmware, Cisco Aironet 1542i Firmware, Cisco Aironet 1562d Firmware, Cisco Aironet 1562e Firmware, Cisco Aironet 1562i Firmware, Cisco Aironet 1815i Firmware and 20 more.
How do I fix CVE-2022-20728?
No fix has been published for CVE-2022-20728 yet. Limit exposure of the affected software until one is available.
Is CVE-2022-20728 being exploited?
There is no known exploitation of CVE-2022-20728 in the wild and no public exploit code.
Other vulnerabilities in Cisco Aironet Access Point Software (IOS XE Controller)
Sources
Also known as GHSA-66v9-vq83-62h5.