CVE-2021-1437: Cisco Aironet Access Point Software

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

A vulnerability in the FlexConnect Upgrade feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, remote attacker to obtain confidential information from an affected device. This vulnerability is due to an unrestricted Trivial File Transfer Protocol (TFTP) configuration. An attacker could exploit this vulnerability by sending a specific TFTP request to an affected device. A successful exploit could allow the attacker to download any file from the filesystem of the affected access point (AP).

Affected products

• Cisco Aironet Access Point Software: affected versions not specified
• Cisco Catalyst 9800 Firmware: from 17.1, before 17.3.3 (fixed in 17.3.3)
• Cisco Wireless Lan Controller Software: from 8.10.112.0, before 8.10.142.0 (fixed in 8.10.142.0)

Published 2021-03-24. Last modified 2026-06-17.