CVE-2021-1439 : A vulnerability in the multicast DNS (mDNS) gateway feature of Cisco Aironet Ser

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.

Published 2021-03-24 20:15:15

Updated 2023-05-22 18:57:25

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: OverflowDenial of service

Products affected by CVE-2021-1439

Cisco » Aironet Access Point Software » Version: N/A
cpe:2.3:a:cisco:aironet_access_point_software:-:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » 1100 Integrated Services Router » Version: N/A
When used together with: Cisco » Aironet 1540 » Version: N/A
When used together with: Cisco » Aironet 1560 » Version: N/A
When used together with: Cisco » Aironet 1800 » Version: N/A
When used together with: Cisco » Aironet 2800 » Version: N/A
When used together with: Cisco » Aironet 3800 » Version: N/A
When used together with: Cisco » Aironet 4800 » Version: N/A
When used together with: Cisco » Catalyst 9100 » Version: N/A
When used together with: Cisco » Catalyst Iw6300 » Version: N/A
When used together with: Cisco » Esw6300 » Version: N/A
Cisco » Catalyst 9800 Firmware
Versions from including (>=) 17.1 and before (<) 17.3.3
cpe:2.3:o:cisco:catalyst_9800_firmware:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Catalyst 9800 » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-1439

EPSS FAQ

0.11%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 26 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-1439

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.3	LOW	AV:A/AC:L/Au:N/C:N/I:N/A:P	6.5	2.9	NIST
Access Vector: Adjacent Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.4	HIGH	CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	2.8	4.0	Cisco Systems, Inc.
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
7.4	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	2.8	4.0	NIST
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-1439

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

The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.

Assigned by: ykramarz@cisco.com (Primary)

References for CVE-2021-1439

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-mdns-dos-E6KwYuMx

Cisco Aironet Access Points FlexConnect Multicast DNS Denial of Service Vulnerability
Vendor Advisory

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Vulnerability Details : CVE-2021-1439

Products affected by CVE-2021-1439

Exploit prediction scoring system (EPSS) score for CVE-2021-1439

CVSS scores for CVE-2021-1439

CWE ids for CVE-2021-1439

References for CVE-2021-1439