8.6
CWE
400
Advisory Published
Updated

CVE-2020-3559: Cisco Aironet Access Point Authentication Flood Denial of Service Vulnerability

First published: Thu Sep 24 2020(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Wireless LAN Controller>=8.9<8.10.112.0
Cisco 1111-4pwe
Cisco 1111-8plteeawb
Cisco 1111-8pwb
Cisco 1113-8plteeawe
Cisco 1113-8pmwe
Cisco 1113-8pwe
Cisco 1116-4plteeawe
Cisco 1116-4pwe
Cisco 1117-4plteeawe
Cisco 1117-4pmlteeawe
Cisco 1117-4pmwe
Cisco 1117-4pwe
Cisco Aironet 1815
Cisco Aironet 1830e
Cisco Aironet 1830i
Cisco Aironet 1850e
Cisco Aironet 1850i
Cisco Business 140ac
Cisco Business 145ac
Cisco Business 240ac
Cisco Business Access Points>=10.0<10.1.1.0
Cisco Access Points<16.12.4a
Cisco Catalyst 9800-40
Cisco Catalyst 9800-80
Cisco Catalyst 9800-cl
Cisco Catalyst 9800-l
Cisco Catalyst 9800-l-c
Cisco Catalyst 9800-l-f
Cisco Aironet Access Point Software=8.5\(151.0\)
Cisco Aironet Access Point Software=17.2.0.26

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Frequently Asked Questions

  • What is CVE-2020-3559?

    CVE-2020-3559 is a vulnerability in Cisco Aironet Access Point (AP) Software that could allow an unauthenticated remote attacker to cause a device to reload.

  • How does the vulnerability in Cisco Aironet Access Point (AP) Software occur?

    The vulnerability is due to improper handling of clients trying to connect to the AP.

  • What is the severity of CVE-2020-3559?

    The severity of CVE-2020-3559 is high with a CVSS score of 8.6.

  • Which software versions are affected by CVE-2020-3559?

    The affected software versions are Cisco Wireless LAN Controller 8.9 to 8.10.112.0.

  • How can I fix the CVE-2020-3559 vulnerability?

    To fix the vulnerability, it is recommended to upgrade the Cisco Aironet Access Point (AP) Software to a version that is not vulnerable.

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