CVE-2021-1439

Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability

Severity Score

7.4

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Track

*SSVC

Descriptions

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.

Una vulnerabilidad en la funcionalidad multicast DNS (mDNS) gateway del Software Cisco Aironet Series Access Points, podría permitir a un atacante adyacente no autenticado causar una condición de denegación de servicio (DoS) en un dispositivo afectado. Esta vulnerabilidad es debido a una comprobación insuficiente de la entrada del tráfico mDNS entrante. Un atacante podría explotar esta vulnerabilidad mediante el envío de un paquete mDNS diseñado hacia un dispositivo afectado por medio de una red inalámbrica configurada en el modo de conmutación local FlexConnect o mediante una red cableada en una VLAN mDNS configurada. Una explotación con éxito podría permitir al atacante causar que el punto de acceso (AP) se reinicie, lo que resultaría en una condición de DoS

*Credits: N/A

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Adjacent

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Track

Exploitation

None

Automatable

Tech. Impact

Partial

* Organization's Worst-case Scenario

Timeline

2020-11-13 CVE Reserved
2021-03-24 CVE Published
2023-12-08 EPSS Updated
2024-11-08 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-mdns-dos-E6KwYuMx	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	1100 Integrated Services Router Search vendor "Cisco" for product "1100 Integrated Services Router"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Aironet 1540 Search vendor "Cisco" for product "Aironet 1540"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Aironet 1560 Search vendor "Cisco" for product "Aironet 1560"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Aironet 1800 Search vendor "Cisco" for product "Aironet 1800"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Aironet 2800 Search vendor "Cisco" for product "Aironet 2800"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Aironet 3800 Search vendor "Cisco" for product "Aironet 3800"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Aironet 4800 Search vendor "Cisco" for product "Aironet 4800"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9100 Search vendor "Cisco" for product "Catalyst 9100"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst Iw6300 Search vendor "Cisco" for product "Catalyst Iw6300"	-	-	Safe
Cisco Search vendor "Cisco"	Aironet Access Point Software Search vendor "Cisco" for product "Aironet Access Point Software"	-	-	Affected	in	Cisco Search vendor "Cisco"	Esw6300 Search vendor "Cisco" for product "Esw6300"	-	-	Safe
Cisco Search vendor "Cisco"	Catalyst 9800 Firmware Search vendor "Cisco" for product "Catalyst 9800 Firmware"	>= 17.1 < 17.3.3 Search vendor "Cisco" for product "Catalyst 9800 Firmware" and version " >= 17.1 < 17.3.3"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst 9800 Search vendor "Cisco" for product "Catalyst 9800"	-	-	Safe