What’s Vulnerable › Vulnerabilities

CVE-2022-20945: Cisco Catalyst 9100 Series Access Points Association Request Denial of Service Vulnerability

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-09-30 · updated 2026-06-17
• Weakness: CWE-120

Description

A vulnerability in the 802.11 association frame validation of Cisco Catalyst 9100 Series Access Points (APs) could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of certain parameters within association request frames received by the AP. An attacker could exploit this vulnerability by sending a crafted 802.11 association request to a nearby device. An exploit could allow the attacker to unexpectedly reload the device, resulting in a DoS condition.

Affected products

• Cisco Catalyst 9800-40 Firmware: from 17.6 before 17.6.4 — fixed in 17.6.4
• Cisco Catalyst 9800-80 Firmware: from 17.6 before 17.6.4 — fixed in 17.6.4
• Cisco Catalyst 9800-Cl Firmware: from 17.6 before 17.6.4 — fixed in 17.6.4
• Cisco Catalyst 9800-L Firmware: from 17.6 before 17.6.4 — fixed in 17.6.4

How to fix

Upgrade to a fixed version: Cisco Catalyst 9800-40 Firmware 17.6.4; Cisco Catalyst 9800-80 Firmware 17.6.4; Cisco Catalyst 9800-Cl Firmware 17.6.4; Cisco Catalyst 9800-L Firmware 17.6.4. Check the vendor advisory for mitigations.

References

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-assoc-dos-EgVqtON8
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ap-assoc-dos-EgVqtON8

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