VLAN separation bypass in Cisco Access Points
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2022-20728 |
| CWE-ID | CWE-284 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
6300 Series Embedded Services Access Points Other software / Other software solutions Aironet 1800 Access Points Other software / Other software solutions Aironet 4800 Access Points Other software / Other software solutions Business 100 Series Access Points Other software / Other software solutions Business 200 Series Access Points Other software / Other software solutions Cisco Aironet 1540 Series Access Points Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Aironet 1560 Series Access Points Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Aironet 2800 Series Access Points Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Aironet 3800 Series Access Points Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Catalyst 9100 Hardware solutions / Routers & switches, VoIP, GSM, etc Catalyst IW6300 AC Heavy Duty Access Point Hardware solutions / Routers & switches, VoIP, GSM, etc Integrated AP on 1100 Integrated Services Routers Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Catalyst 9800 Wireless Controller Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Wireless LAN Controller Hardware solutions / Firmware |
| Vendor | Cisco Systems, Inc |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Improper access control
EUVDB-ID: #VU67708
Risk: Medium
CVSSv3.1: 4.1 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2022-20728
CWE-ID:
CWE-284 - Improper Access Control
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists 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. A remote non-authenticated attacker on the local network with access to the native VLAN can direct traffic directly to the client through their MAC/IP combination, and as a result bypass VLAN separation and potentially also bypass any Layer 3 protection mechanisms that are deployed.
MitigationInstall updates from vendor's website.
Vulnerable software versions6300 Series Embedded Services Access Points: All versions
Cisco Aironet 1540 Series Access Points: All versions
Cisco Aironet 1560 Series Access Points: All versions
Aironet 1800 Access Points: All versions
Cisco Aironet 2800 Series Access Points: All versions
Cisco Aironet 3800 Series Access Points: All versions
Aironet 4800 Access Points: All versions
Business 100 Series Access Points: All versions
Business 200 Series Access Points: All versions
Cisco Catalyst 9100: All versions
Catalyst IW6300 AC Heavy Duty Access Point : All versions
Integrated AP on 1100 Integrated Services Routers: All versions
Cisco Wireless LAN Controller: before 8.10MR8
Cisco Catalyst 9800 Wireless Controller: before 17.6.2
External linkshttp://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apvlan-TDTtb4FY
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz99036
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
