CVE-2021-1230: Cisco Nexus 9000 Series Fabric Switches ACI Mode BGP Route Installation Denial of Service Vulnerability

Published Feb 24, 2021

Updated

A vulnerability with the Border Gateway Protocol (BGP) for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a routing process to crash, which could lead to a denial of service (DoS) condition. This vulnerability is due to an issue with the installation of routes upon receipt of a BGP update. An attacker could exploit this vulnerability by sending a crafted BGP update to an affected device. A successful exploit could allow the attacker to cause the routing process to crash, which could cause the device to reload. This vulnerability applies to both Internal BGP (IBGP) and External BGP (EBGP). Note: The Cisco implementation of BGP accepts incoming BGP traffic from explicitly configured peers only. To exploit this vulnerability, an attacker would need to send a specific BGP update message over an established TCP connection that appears to come from a trusted BGP peer.

Affected Software

143 affected components

Cisco NX-OS=12.0\(1m\)

Cisco NX-OS=12.0\(1n\)

Cisco NX-OS=12.0\(1o\)

Cisco NX-OS=12.0\(1p\)

Cisco NX-OS=12.0\(1q\)

Cisco NX-OS=12.0\(1r\)

Cisco NX-OS=12.0\(2f\)

Cisco NX-OS=12.0\(2g\)

Cisco NX-OS=12.0\(2h\)

Cisco NX-OS=12.0\(2l\)

Cisco NX-OS=12.0\(2m\)

Cisco NX-OS=12.0\(2n\)

Cisco NX-OS=12.0\(2o\)

Cisco NX-OS=12.1\(1h\)

Cisco NX-OS=12.1\(1i\)

Cisco NX-OS=12.1\(2e\)

Cisco NX-OS=12.1\(2g\)

Cisco NX-OS=12.1\(2k\)

Cisco NX-OS=12.1\(3g\)

Cisco NX-OS=12.1\(3h\)

Cisco NX-OS=12.1\(3j\)

Cisco NX-OS=12.1\(4a\)

Cisco NX-OS=12.2\(1k\)

Cisco NX-OS=12.2\(1n\)

Cisco NX-OS=12.2\(1o\)

Cisco NX-OS=12.2\(2e\)

Cisco NX-OS=12.2\(2f\)

Cisco NX-OS=12.2\(2i\)

Cisco NX-OS=12.2\(2j\)

Cisco NX-OS=12.2\(2k\)

Cisco NX-OS=12.2\(2q\)

Cisco NX-OS=12.2\(3j\)

Cisco NX-OS=12.2\(3p\)

Cisco NX-OS=12.2\(3r\)

Cisco NX-OS=12.2\(3s\)

Cisco NX-OS=12.2\(3t\)

Cisco NX-OS=12.2\(4f\)

Cisco NX-OS=12.2\(4p\)

Cisco NX-OS=12.2\(4q\)

Cisco NX-OS=12.2\(4r\)

Cisco NX-OS=12.3\(1e\)

Cisco NX-OS=12.3\(1f\)

Cisco NX-OS=12.3\(1i\)

Cisco NX-OS=12.3\(1l\)

Cisco NX-OS=12.3\(1o\)

Cisco NX-OS=12.3\(1p\)

Cisco NX-OS=13.0\(1k\)

Cisco NX-OS=13.0\(2h\)

Cisco NX-OS=13.0\(2k\)

Cisco NX-OS=13.0\(2n\)

Cisco NX-OS=13.1\(1i\)

Cisco NX-OS=13.1\(2m\)

Cisco NX-OS=13.1\(2o\)

Cisco NX-OS=13.1\(2p\)

Cisco NX-OS=13.1\(2q\)

Cisco NX-OS=13.1\(2s\)

Cisco NX-OS=13.1\(2t\)

Cisco NX-OS=13.1\(2u\)

Cisco NX-OS=13.1\(2v\)

Cisco NX-OS=13.2\(1l\)

Cisco NX-OS=13.2\(1m\)

Cisco NX-OS=13.2\(2l\)

Cisco NX-OS=13.2\(2o\)

Cisco NX-OS=13.2\(3i\)

Cisco NX-OS=13.2\(3j\)

Cisco NX-OS=13.2\(3n\)

Cisco NX-OS=13.2\(3o\)

Cisco NX-OS=13.2\(3r\)

Cisco NX-OS=13.2\(3s\)

Cisco NX-OS=13.2\(4d\)

Cisco NX-OS=13.2\(4e\)

Cisco NX-OS=13.2\(5d\)

Cisco NX-OS=13.2\(5e\)

Cisco NX-OS=13.2\(5f\)

Cisco NX-OS=13.2\(6i\)

Cisco NX-OS=13.2\(7f\)

Cisco NX-OS=13.2\(7k\)

Cisco NX-OS=13.2\(8d\)

Cisco NX-OS=13.2\(9b\)

Cisco NX-OS=13.2\(9f\)

Cisco NX-OS=13.2\(9h\)

Cisco NX-OS=13.2\(41d\)

Cisco NX-OS=14.0\(1h\)

Cisco NX-OS=14.0\(2c\)

Cisco NX-OS=14.0\(3c\)

Cisco NX-OS=14.0\(3d\)

Cisco NX-OS=14.1\(1i\)

Cisco NX-OS=14.1\(1j\)

Cisco NX-OS=14.1\(1k\)

Cisco NX-OS=14.1\(1l\)

Cisco NX-OS=14.1\(2g\)

Cisco NX-OS=14.1\(2m\)

Cisco NX-OS=14.1\(2o\)

Cisco NX-OS=14.1\(2s\)

Cisco NX-OS=14.1\(2u\)

Cisco NX-OS=14.1\(2w\)

Cisco NX-OS=14.1\(2x\)

Cisco NX-OS=14.2\(1i\)

Cisco NX-OS=14.2\(1j\)

Cisco NX-OS=14.2\(1l\)

Cisco NX-OS=14.2\(2e\)

Cisco NX-OS=14.2\(2f\)

Cisco NX-OS=14.2\(2g\)

Cisco Nexus 9000v

Cisco Nexus 92160yc-x

Cisco Nexus 92300yc

Cisco Nexus 92304qc

Cisco Nexus 92348gc-x

Cisco Nexus 9236c

Cisco Nexus 9272q

Cisco Nexus 93108tc-ex

Cisco Nexus 93108tc-ex-24

Cisco Nexus 93108tc-fx

Cisco Nexus 93108tc-fx-24

Cisco Nexus 93120tx

Cisco Nexus 93128tx

Cisco Nexus 9316d-gx

Cisco Nexus 93180lc-ex

Cisco Nexus 93180yc-ex

Cisco Nexus 93180yc-ex-24

Cisco Nexus 93180yc-fx

Cisco Nexus 93180yc-fx-24

Cisco Nexus 93180yc-fx3

Cisco Nexus 93180yc-fx3s

Cisco Nexus 93216tc-fx2

Cisco Nexus 93240yc-fx2

Cisco Nexus 9332c

Cisco Nexus 9332pq

Cisco Nexus 93360yc-fx2

Cisco Nexus 9336c-fx2

Cisco Nexus 9336c-fx2-e

Cisco Nexus 9336pq Aci Spine

Cisco Nexus 9348gc-fxp

Cisco Nexus 93600cd-gx

Cisco Nexus 9364c

Cisco Nexus 9364c-gx

Cisco Nexus 9372px

Cisco Nexus 9372px-e

Cisco Nexus 9372tx

Cisco Nexus 9372tx-e

Cisco Nexus 9396px

Cisco Nexus 9396tx

Cisco Nexus 9508

Event History

Feb 24, 2021

CVE Published

via MITRE·07:30 PM

Data Sourced

via MITRE·07:30 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What is the severity of CVE-2021-1230?

CVE-2021-1230 is classified with a high severity rating due to its potential to cause a denial of service (DoS) condition.

How do I fix CVE-2021-1230?

To fix CVE-2021-1230, update the affected Cisco Nexus 9000 Series Fabric Switches to a patched version of the NX-OS software.

Who is affected by CVE-2021-1230?

CVE-2021-1230 affects Cisco Nexus 9000 Series Fabric Switches operating in Application Centric Infrastructure (ACI) mode.

What makes CVE-2021-1230 a significant threat?

CVE-2021-1230 allows unauthenticated, remote attackers to crash routing processes, potentially leading to network outages.

Are there any workarounds for CVE-2021-1230?

Cisco has not provided specific workarounds for CVE-2021-1230; the recommended action is to upgrade to the latest NX-OS versions.

CVE-2021-1230: Cisco Nexus 9000 Series Fabric Switches ACI Mode BGP Route Installation Denial of Service Vulnerability

Affected Software

Event History

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Frequently Asked Questions

What is the severity of CVE-2021-1230?

How do I fix CVE-2021-1230?

Who is affected by CVE-2021-1230?

What makes CVE-2021-1230 a significant threat?

Are there any workarounds for CVE-2021-1230?

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