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Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers Application Visibility and Control Denial of Service Vulnerability

<p>A vulnerability in the Application Visibility and Control (AVC-FNF) feature of Cisco&nbsp;IOS XE Software for Cisco&nbsp;Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.</p>
<p>This vulnerability is due to insufficient packet verification for traffic inspected by the AVC feature. An attacker could exploit this vulnerability by sending crafted packets from the wired network to a wireless client, resulting in the crafted packets being processed by the wireless controller. A successful exploit could allow the attacker to cause a crash and reload of the affected device, resulting in a DoS condition.</p>
<p>Cisco&nbsp;has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.</p>
<p>This advisory is available at the following link:<br><a href="https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-fnf-dos-bOL5vLge" target="_blank">https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-fnf-dos-bOL5vLge</a></p>

<p>This advisory is part of the April 2022 release of the Cisco&nbsp;IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see <a href="https://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74561">Cisco&nbsp;Event Response: April 2022 Semiannual Cisco&nbsp;IOS and IOS XE Software Security Advisory Bundled Publication.</a></p>


     
         
Security Impact Rating:  High
   
   
       
CVE: CVE-2022-20683
Source: Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers Application Visibility and Control Denial of Service Vulnerability (https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-fnf-dos-bOL5vLge?vs_f=Cisco%20Security%20Advisory&vs_cat=Security%20Intelligence&vs_type=RSS&vs_p=Cisco%20IOS%20XE%20Software%20for%20Catalyst%209800%20Series%20Wireless%20Controllers%20Application%20Visibility%20and%20Control%20Denial%20of%20Service%20Vulnerability&vs_k=1)