Vulnerability identifier: #VU73971

Vulnerability risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20056

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Cisco Wireless LAN Controller
Hardware solutions / Firmware
Catalyst 9800 Wireless Controller Software
Hardware solutions / Routers & switches, VoIP, GSM, etc
Cisco Aironet 1540 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Aironet 1560 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Aironet 1800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Aironet 2800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Aironet 3800 Series Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 9100 Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc
Integrated Access Point on 1100 Integrated Services Routers
Hardware solutions / Routers & switches, VoIP, GSM, etc
6300 Series Embedded Services Access Points
Other software / Other software solutions
Aironet 4800 Access Points
Other software / Other software solutions
Catalyst IW6300 Heavy Duty Series Access Points
Other software / Other software solutions

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the management CLI. A local user can pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Wireless LAN Controller: 8.9 - 8.10

Catalyst 9800 Wireless Controller Software: 16.11 - 17.9

6300 Series Embedded Services Access Points: All versions

Cisco Aironet 1540 Series Access Points: All versions

Aironet 1560 Series Access Points: All versions

Aironet 1800 Series Access Points: All versions

Aironet 2800 Series Access Points: All versions

Aironet 3800 Series Access Points: All versions

Aironet 4800 Access Points: All versions

Catalyst 9100 Access Points: All versions

Catalyst IW6300 Heavy Duty Series Access Points: All versions

Integrated Access Point on 1100 Integrated Services Routers: All versions

---

External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-cli-dos-tc2EKEpu

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.