CVE-2020-3552: Cisco Access Points

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

A vulnerability in the Ethernet packet handling of Cisco Aironet Access Points (APs) Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by connecting as a wired client to the Ethernet interface of an affected device and sending a series of specific packets within a short time frame. A successful exploit could allow the attacker to cause a NULL pointer access that results in a reload of the affected device.

Affected products

• Cisco Access Points: before 16.12.4a (fixed in 16.12.4a)
• Cisco Aironet Access Point Software: version 8.10(1.255) only
• Cisco Business Access Points: from 10.0, before 10.1.1.0 (fixed in 10.1.1.0)
• Cisco Wireless Lan Controller: from 8.6, before 8.10.105.0 (fixed in 8.10.105.0)

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