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Vulnerability record · CVE-2016-9221 · published 26 January 2017

CVE-2016-9221: Cisco aironet access point software vulnerability

Cisco · Aironet Access Point Software

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).

4.3 CVSS 3.0 Medium EPSS 0.54% · top 56.3% CWE-399 · CWE-399
4.3CVSS 3.0 base score, v2 3.3
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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).

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/95631 Third Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170118-cme2 Vendor Advisory
http://www.securityfocus.com/bid/95631 Third Party AdvisoryVDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170118-cme2 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-3831Cisco aironet access point software permissions and access controls vulnerabilityA vulnerability in the web-based GUI of Cisco Mobility Express 1800 Series Access Points could allow an unauthenticated, remote attacker to bypass au…EPSS 5.3%8.6CVE-2020-3560Cisco wireless lan controller uncontrolled resource consumption vulnerabilityA vulnerability in Cisco Aironet Access Points (APs) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) on an affecte…EPSS 1.4%8.6CVE-2020-3559Cisco wireless lan controller uncontrolled resource consumption vulnerabilityA vulnerability in Cisco Aironet Access Point (AP) Software could allow an unauthenticated, remote attacker to cause an affected device to reload. Th…EPSS 1.4%8.6CVE-2018-0234Cisco aironet access point software improper input validation vulnerabilityA vulnerability in the implementation of Point-to-Point Tunneling Protocol (PPTP) functionality in Cisco Aironet 1810, 1830, and 1850 Series Access P…EPSS 3.8%8.1CVE-2016-1419Cisco aironet access point software improper input validation vulnerabilityCisco Access Point devices with software 8.2(102.43) allow remote attackers to cause a denial of service (device reload) via crafted ARP packets, aka…EPSS 0.73%7.8CVE-2016-6362Cisco aironet access point software permissions and access controls vulnerabilityCisco Aironet 1800, 2800, and 3800 devices with software before 8.2.110.0, 8.2.12x before 8.2.121.0, and 8.3.x before 8.3.102.0 allow local users to …EPSS 0.40%7.8CVE-2015-6367Cisco aironet access point software vulnerabilityCisco Aironet 1800 devices with software 8.1(131.0) allow remote attackers to cause a denial of service (CPU consumption) by improperly establishing …EPSS 1.9%7.5CVE-2022-20622Cisco aironet access point software allocation without limits vulnerabilityA vulnerability in IP ingress packet processing of the Cisco Embedded Wireless Controller with Catalyst Access Points Software could allow an unauthe…EPSS 1.4%

Source: NIST National Vulnerability Database (record CVE-2016-9221), CISA KEV, FIRST EPSS (scores of 2026-10-04). This page is refreshed as NVD updates the record.