CVE-2019-1826: Cisco Aironet Series Access Points Quality of Service Denial of Service Vulnerability

Security readout for executives and security teams

CVE-2019-1826 can let an authenticated nearby wireless user crash affected Cisco Aironet access points. The business impact is wireless outage or instability, not data theft. Risk is bounded by the need for adjacent Wi-Fi access and authentication, but affected APs may fail hard enough to disrupt users. Exposure is most likely in environments running Cisco Aironet Access Point Software 8.5. The attacker must be adjacent to the wireless network and authenticated, so guest, BYOD, campus, retail, and shared wireless environments may have higher practical exposure than tightly controlled sites. Treat as a moderate operational resilience issue. It does not indicate data compromise, but affected APs can be crashed by an authenticated nearby user, which can disrupt branch, campus, or customer-facing wireless service. Mitigation focus: Inventory Cisco Aironet APs running Aironet Access Point Software 8.5.; Review Cisco’s advisory for fixed software and supported workaround guidance.; Prioritize remediation for high-dependency wireless sites and shared-access networks..

Prepared

May 24, 2026, 12:07 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.