high
7.4
CWE
401 789
Advisory Published
Updated

CVE-2023-20089: Cisco Nexus 9000 Series Fabric Switches in ACI Mode Link Layer Discovery Protocol Memory Leak Denial of Service Vulnerability

First published: Thu Feb 23 2023(Updated: )

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, adjacent attacker to cause a memory leak, which could result in an unexpected reload of the device. This vulnerability is due to incorrect error checking when parsing ingress LLDP packets. An attacker could exploit this vulnerability by sending a steady stream of crafted LLDP packets to an affected device. A successful exploit could allow the attacker to cause a memory leak, which could result in a denial of service (DoS) condition when the device unexpectedly reloads. Note: This vulnerability cannot be exploited by transit traffic through the device. The crafted LLDP packet must be targeted to a directly connected interface, and the attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). In addition, the attack surface for this vulnerability can be reduced by disabling LLDP on interfaces where it is not required.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco NX-OS=15.2\(1g\)
Cisco NX-OS=15.2\(2e\)
Cisco NX-OS=15.2\(2f\)
Cisco NX-OS=15.2\(2g\)
Cisco NX-OS=15.2\(2h\)
Cisco NX-OS=15.2\(3e\)
Cisco NX-OS=15.2\(3f\)
Cisco NX-OS=15.2\(3g\)
Cisco NX-OS=15.2\(4d\)
Cisco NX-OS=15.2\(4e\)
Cisco NX-OS=15.2\(4f\)
Cisco NX-OS=15.2\(5c\)
Cisco NX-OS=15.2\(5d\)
Cisco NX-OS=15.2\(5e\)
Cisco NX-OS=16.0\(1g\)
Cisco NX-OS=16.0\(1j\)
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 93108TC-FX3P Firmware
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 9332D-GX2B 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 9348D-GX2A
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 93600CD-GX Firmware
Cisco Nexus 9364c-h1
Cisco Nexus 9364C-GX Firmware
Cisco Nexus 9364D-GX2A 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 9408
Cisco Nexus 9508
Cisco Nexus 9808

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID for this Cisco Nexus 9000 Series Fabric Switches vulnerability?

    The vulnerability ID for this Cisco Nexus 9000 Series Fabric Switches vulnerability is CVE-2023-20089.

  • What is the severity level of CVE-2023-20089?

    The severity level of CVE-2023-20089 is high with a CVSS score of 6.5.

  • What is the affected software in this vulnerability?

    The affected software in this vulnerability is Cisco Nexus 9000 Series Fabric Switches running Cisco NX-OS versions 15.2(1g) to 16.0(1j).

  • How can an attacker exploit CVE-2023-20089?

    An unauthenticated, adjacent attacker can exploit CVE-2023-20089 by causing a memory leak, which could result in an unexpected reload of the device.

  • Is there a fix for CVE-2023-20089?

    Yes, Cisco has released software updates to address the vulnerability in CVE-2023-20089.

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