Denial of service in Cisco Aironet Access Points

1) Buffer overflow

EUVDB-ID: #VU51721

Risk: Low

CVSSv3.1: 6.4 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1439

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error in the multicast DNS (mDNS) gateway feature. A remote attacker on the local network can send a specially crafted mDNS packet, trigger memory corruption and cause a denial of service condition on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco Aironet 1540 Series Access Points: 17.2 - 17.4

Cisco Aironet 1560 Series Access Points: 17.2 - 17.4

Cisco Aironet 1800 Series Access Points: 17.2 - 17.4

Cisco Aironet 2800 Series Access Points: 17.2 - 17.4

Cisco Aironet 3800 Series Access Points: 17.2 - 17.4

Cisco 4800 Aironet Access Points: 17.2 - 17.4

Cisco Catalyst 9100: 17.2 - 17.4

Cisco Catalyst IW 6300: 17.2 - 17.4

Integrated AP on 1100 Integrated Services Routers: 17.2 - 17.4

Cisco ESW6300 Series Access Points: 17.2 - 17.4

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aironet-mdns-dos-E6Kw...

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected device in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.