Vulnerability identifier: #VU50938

Vulnerability risk: Low

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

CVE-ID: CVE-2021-1228

CWE-ID: CWE-284

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Cisco Nexus 9000 Series Switches in ACI Mode
Hardware solutions / Routers & switches, VoIP, GSM, etc

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. A remote attacker on the local network can send a specially crafted LLDP packet and make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco Nexus 9000 Series Switches in ACI Mode: 14.1.2g

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External links
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n9kaci-unauth-access-5PWzDx2w

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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).

Is there known malware, which exploits this vulnerability?

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