VULNERABILITY INTELLIGENCE

CVE-2021-1231

CVSS score4.7 MEDIUM
EPSS probability0.25%
CISA KEVNot currently listed
Published2021-02-24
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L

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.

Weakness classification

  • psirt@cisco.com: CWE-284
  • nvd@nist.gov: CWE-346

Primary references