CVE-2016-9221: Cisco Aironet Access Point Software

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

A Denial of Service Vulnerability in 802.11 ingress connection authentication handling for the Cisco Mobility Express 2800 and 3800 Access Points (APs) could allow an unauthenticated, adjacent attacker to cause authentication to fail. Affected Products: This vulnerability affects Cisco Mobility Express 2800 Series and 3800 Series Access Points when configured in local mode in 40 MHz. More Information: CSCvb33575. Known Affected Releases: 8.2(121.12) 8.4(1.82). Known Fixed Releases: 8.2(131.2) 8.2(131.3) 8.2(131.4) 8.2(141.0) 8.3(104.53) 8.3(104.54) 8.4(1.80) 8.4(1.85).

Affected products

• Cisco Aironet Access Point Software: version 8.2(121.12) only; version 8.4(1.82) only

Published 2017-01-26. Last modified 2026-06-17.