CVE-2021-1231

Cisco Nexus 9000 Series Fabric Switches ACI Mode Link Layer Discovery Protocol Port Denial of Service Vulnerability

State: Published
Severity: 4.7 Medium
Published: Feb 24, 2021
Updated: Nov 8, 2024
Reserved: Nov 13, 2020

Description

A vulnerability in the Link Layer Discovery Protocol (LLDP) for Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, adjacent attacker to disable switching on a small form-factor pluggable (SFP) interface. This vulnerability is due to incomplete validation of the source of a received LLDP packet. An attacker could exploit this vulnerability by sending a crafted LLDP packet on an SFP interface to an affected device. A successful exploit could allow the attacker to disable switching on the SFP interface, which could disrupt network traffic.

Scores

CVSS	Score	Vector	Source
3.1	4.7 Medium	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L	cisco

Weaknesses

CWE-284

Affected Products

Product	Versions
Cisco NX-OS System Software in ACI ModeCisco	n/aAffected

References

20210224 Cisco Nexus 9000 Series Fabric Switches ACI Mode Link Layer Discovery Protocol Port Denial of Service Vulnerabilityvendor-advisory

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