CVE-2021-1423

Cisco Aironet Access Points Arbitrary File Overwrite Vulnerability

MEDIUM

4.4

CVSS Score

Published: March 24, 2021 at 08:20 PM UTC

Updated: June 17, 2026 at 03:31 AM UTC

14 products affected across 1 vendorWireless LAN Controller SoftwareAironet Access PointCatalyst 9800 Firmware

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Severity

MEDIUM4.4

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Aironet Access Point · Cisco

95%

All versions

cisco-1100-integrated-services-router (environment) · cisco-aironet-1540 (environment) · cisco-aironet-1560 (environment) · cisco-aironet-1800 (environment) · cisco-aironet-2800 (environment) · cisco-aironet-3800 (environment) · cisco-aironet-4800 (environment) · cisco-catalyst-9100 (environment) · cisco-catalyst-iw6300 (environment) · cisco-esw6300 (environment)

Catalyst 9800 Firmware · Cisco

95%

v < 16.12.517.1 ≤ v ≤ 17.2

Affected range stops below 16.12.5, so it looks safe — our inference, not a vendor statement

cisco-catalyst-9800 (same device)

Wireless LAN Controller Software · Cisco

95%

v < 8.5.171.08.6 ≤ v < 8.10.130.0

Affected range stops below 8.10.130.0, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.5.171.0, so it looks safe — our inference, not a vendor statement

1100 Integrated Services Router · Ciscodevice

80%