CVE-2021-1439 HIGH

CVE-2021-1439: Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability

Vendor Cisco
Product Cisco Aironet Access Point Software (IOS XE Controller)
Weakness CWE-120
Published March 24, 2021
Last update November 8, 2024

CVSS base score

7.4/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco Aironet Series Access Points Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation of incoming mDNS traffic. An attacker could exploit this vulnerability by sending a crafted mDNS packet to an affected device through a wireless network that is configured in FlexConnect local switching mode or through a wired network on a configured mDNS VLAN. A successful exploit could allow the attacker to cause the access point (AP) to reboot, resulting in a DoS condition.

Key dates

02Disclosure timeline

March 24, 2021 CVE published
November 8, 2024 Record updated