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CVE-2021-1231

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

Published: Feb 24, 2021Updated: Nov 21, 2024 Sources: CVE List NVD BDUCWE-284
NVD MITRE
4.7CVSSMEDIUM
EPSS Score
0.2%
Top 84.5%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:CC:NI:NA:L
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:LAvailability
Low
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Weaknesses

CWE-284CWE-346

Affected Products

Cisco NX-OS System Software in ACI ModeCisco
On-prem
Networking Infrastructure / router-switch
nx-oscisco
On-premFirmware
Networking Infrastructure / router-switch
NX-OSCisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-lldap-dos-WerV9CFj
tools.cisco.com
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apic-lldap-dos-WerV9CFj
tools.cisco.com
https://nvd.nist.gov/vuln/detail/CVE-2021-1231
nvd.nist.gov

Timeline

Published
Feb 24, 2021
Last Updated
Nov 21, 2024

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