Vulnerability identifier: #VU81291

Vulnerability risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-20202

CWE-ID: CWE-20

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco IOS XE
Operating systems & Components / Operating system
Catalyst 9800 Embedded Wireless Controller
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 9800 Series Wireless Controllers
Hardware solutions / Routers & switches, VoIP, GSM, etc
Catalyst 9800-CL Wireless Controllers for Cloud
Hardware solutions / Routers & switches, VoIP, GSM, etc
Embedded Wireless Controllers on Catalyst Access Points
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input in the Wireless Network Control daemon (wncd). A remote attacker on the local network 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 IOS XE: 17.8.1 - 17.9.2

Catalyst 9800 Embedded Wireless Controller: All versions

Catalyst 9800 Series Wireless Controllers: All versions

Catalyst 9800-CL Wireless Controllers for Cloud: All versions

Embedded Wireless Controllers on Catalyst Access Points: All versions

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External links
http://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wlc-wncd-HFGMsfSD

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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.