CVE-2022-20683

A vulnerability in the Application Visibility and Control (AVC-FNF) feature of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. 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.

• CWE-124
• CWE-787

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-fnf-dos-bOL5vLgeVendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-c9800-fnf-dos-bOL5vLgeVendor Advisory

Published

Apr 15, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2022-20678A vulnerability in the AppNav-XE feature of Cisco IOS XE Sof…7.5
• CVE-2022-20679A vulnerability in the IPSec decryption routine of Cisco IOS…7.7
• CVE-2022-2068In addition to the c_rehash shell command injection identifi…7.3
• CVE-2022-20680A vulnerability in the web-based management interface of Cis…6.5
• CVE-2022-20681A vulnerability in the CLI of Cisco IOS XE Software for Cisc…7.8
• CVE-2022-20682A vulnerability in the Control and Provisioning of Wireless …8.6
• CVE-2022-20684A vulnerability in Simple Network Management Protocol (SNMP)…6.5
• CVE-2022-20685A vulnerability in the Modbus preprocessor of the Snort dete…7.5
• CVE-2022-20686Multiple vulnerabilities in the Link Layer Discovery Protoco…5.3
• CVE-2022-20687Multiple vulnerabilities in the Link Layer Discovery Protoco…5.3
• CVE-2022-20688A vulnerability in the Cisco Discovery Protocol functionalit…5.3
• CVE-2022-20689Multiple vulnerabilities in the Cisco Discovery Protocol fun…8.8