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Vulnerability record · CVE-2020-3559 · published 24 September 2020

CVE-2020-3559: Cisco wireless lan controller uncontrolled resource consumption vulnerability

Cisco · Wireless Lan Controller

A vulnerability in Cisco Aironet Access Point (AP) Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper handling of clients that are trying to connect to the AP. An attacker could exploit this vulnerability by sending authentication requests from multiple clients to an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

8.6 CVSS 3.1 High EPSS 1.4% · top 28.5% CWE-400 · Uncontrolled resource consumption
8.6CVSS 3.1 base score, v2 7.8
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A vulnerability in Cisco Aironet Access Point (AP) Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper handling of clients that are trying to connect to the AP. An attacker could exploit this vulnerability by sending authentication requests from multiple clients to an affected device. A successful exploit could allow the attacker to cause the affected device to reload.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

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

References

LinkTags
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-dos-h3DCuLXw Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-dos-h3DCuLXw Vendor Advisory

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Related vulnerabilities

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

10.0CVE-2014-0703Cisco wireless lan controller software race condition vulnerabilityCisco Wireless LAN Controller (WLC) devices 7.4 before 7.4.110.0 distribute Aironet IOS software with a race condition in the status of the administr…EPSS 2.0%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-2024-20271Cisco ios xe improper input validation vulnerabilityA vulnerability in the IP packet processing of Cisco Access Point (AP) Software could allow an unauthenticated, remote attacker to cause a denial of …EPSS 0.63%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-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-2018-0417Cisco wireless lan controller software permissions and access controls vulnerabilityA vulnerability in TACACS authentication with Cisco Wireless LAN Controller (WLC) Software could allow an authenticated, local attacker to perform ce…EPSS 3.2%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%

Source: NIST National Vulnerability Database (record CVE-2020-3559), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.