high
8.6
CWE
233
Advisory Published
Updated

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

First published: Wed 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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
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 NX-OS Nexus 9000 Series
Cisco Nexus 92160YC Switch
Cisco Nexus 92300YC Firmware
Cisco Nexus 92304QC Switch
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9236C Switch
Cisco Nexus 9272Q Switch
Cisco Nexus
Cisco Nexus 93108TC-EX-24 Firmware
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93120TX Firmware
Cisco Nexus 93128 Firmware
Cisco Nexus 9316D-GX Firmware
Cisco Nexus 93180LC-EX Switch
Cisco Nexus 93180YC-EX-24
Cisco Nexus 93180YC-EX-24 Firmware
Cisco Nexus 93180YC-FX Firmware
Cisco Nexus 93180YC-FX-24 Firmware
Cisco Nexus 93180YC-FX3 Firmware
Cisco Nexus 93180YC-FX3S Firmware
Cisco Nexus 93216TC-FX2 Firmware
Cisco Nexus 93240YC-FX2 Firmware
Cisco Nexus 9332C Firmware
Cisco Nexus 9332PQ Firmware
Cisco Nexus 93360YC-FX2
Cisco Nexus 9336C-FX2 Firmware
Cisco Nexus 9336C-FX2-E Firmware
Cisco Nexus N9336PQ-X
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 93600CD-GX Firmware
Cisco Nexus 9364c-h1
Cisco Nexus 9364C-GX Firmware
Cisco Nexus 9372PX-E
Cisco Nexus 9372PX-E Firmware
Cisco Nexus 9372TX
Cisco Nexus 9372TX-E Switch
Cisco Nexus 9396PX Firmware
Cisco Nexus 9396TX Firmware
Cisco Nexus 9508

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Reference Links

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.

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