CVE-2021-1423: Cisco Aironet Access Point Software

Medium severity, CVSS 4.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability in the implementation of a CLI command in Cisco Aironet Access Points (AP) could allow an authenticated, local attacker to overwrite files in the flash memory of the device. This vulnerability is due to insufficient input validation for a specific command. An attacker could exploit this vulnerability by issuing a command with crafted arguments. A successful exploit could allow the attacker to overwrite or create files with data that is already present in other files that are hosted on the affected device.

Affected products

• Cisco Aironet Access Point Software: affected versions not specified
• Cisco Catalyst 9800 Firmware: before 16.12.5 (fixed in 16.12.5); from 17.1, up to and including 17.2
• Cisco Wireless Lan Controller Software: before 8.5.171.0 (fixed in 8.5.171.0); from 8.6, before 8.10.130.0 (fixed in 8.10.130.0)

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