CVE-2020-3262: Cisco 5508 Wireless Controller Firmware

High severity, CVSS 7.5. EPSS: 1.5% chance of exploitation in the next 30 days.

A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol handler of Cisco Wireless LAN Controller (WLC) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient validation of CAPWAP packets. An attacker could exploit this vulnerability by sending a malformed CAPWAP packet to an affected device. A successful exploit could allow the attacker to cause the affected device to restart, resulting in a DoS condition.

Affected products

• Cisco 5508 Wireless Controller Firmware: version 8.8(120.0) only
• Cisco 5520 Wireless Controller Firmware: version 8.8(120.0) only

Published 2020-04-15. Last modified 2026-06-17.