CVE-2020-3493: Cisco IOS XE

High severity, CVSS 7.4. EPSS: 0.5% chance of exploitation in the next 30 days.

Multiple vulnerabilities in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol processing of Cisco IOS XE Software for Cisco Catalyst 9800 Series Wireless Controllers could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition of an affected device. These vulnerabilities are due to insufficient validation of CAPWAP packets. An attacker could exploit these vulnerabilities by sending a malformed CAPWAP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to crash and reload, resulting in a DoS condition on the affected device.

Affected products

• Cisco IOS XE: version 16.12.1 only

Published 2020-09-24. Last modified 2026-06-17.