CVE-2021-1439: Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability
First published: Wed Mar 24 2021(Updated: )
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.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Aironet Access Point Software | ||
| Cisco 1100 Integrated Services Router | ||
| Cisco Aironet 1540 | ||
| Cisco Aironet 1560 | ||
| Cisco Aironet 1800 | ||
| Cisco Aironet 2800 | ||
| Cisco Aironet 3800 | ||
| Cisco Aironet 4800 | ||
| Cisco Catalyst 9100 | ||
| Cisco Catalyst Iw6300 | ||
| Cisco Esw6300 | ||
| Cisco Catalyst 9800 Firmware | >=17.1<17.3.3 | |
| Cisco Catalyst 9800 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2021-1439.
What is the severity of CVE-2021-1439?
The severity of CVE-2021-1439 is high with a score of 7.4.
What is the affected software for CVE-2021-1439?
The affected software for CVE-2021-1439 is Cisco Aironet Series Access Points Software.
What is the impact of CVE-2021-1439?
The impact of CVE-2021-1439 is a denial of service (DoS) condition on an affected device.
How can I fix CVE-2021-1439?
To fix CVE-2021-1439, it is recommended to apply the necessary updates or patches provided by Cisco.
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