7.1
CWE
120 20
Advisory Published
Updated

CVE-2023-20168: Input Validation

First published: Wed Aug 23 2023(Updated: )

A vulnerability in TACACS+ and RADIUS remote authentication for Cisco NX-OS Software could allow an unauthenticated, local attacker to cause an affected device to unexpectedly reload. This vulnerability is due to incorrect input validation when processing an authentication attempt if the directed request option is enabled for TACACS+ or RADIUS. An attacker could exploit this vulnerability by entering a crafted string at the login prompt of an affected device. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
All of
Any of
Cisco NX-OS=9.3\(11\)
Cisco NX-OS=10.2\(5\)
Any of
Cisco Nexus 3048 Firmware
Cisco Nexus 31108PC-V Firmware
Cisco Nexus 31108TC-V Firmware
Cisco Nexus 31128PQ
Cisco Nexus 3132C-Z Firmware
Cisco Nexus 3132Q-V Firmware
Cisco Nexus 3132Q-XL Firmware
Cisco Nexus 3164Q Firmware
Cisco Nexus 3172PQ/PQ-XL
Cisco Nexus 3172PQ-XL Firmware
Cisco Nexus 3172TQ Firmware
Cisco Nexus 3172TQ-XL
Cisco Nexus 3172TQ-XL Firmware
Cisco Nexus 3232
Cisco Nexus 3264C-E Firmware
Cisco Nexus 3264Q Firmware
Cisco Nexus 3408-S Firmware
Cisco Nexus 34180YC Firmware
Cisco Nexus 34200YC-SM Firmware
Cisco Nexus 3432D-S Firmware
Cisco Nexus 3464C Firmware
Cisco Nexus 3524-xl
Cisco Nexus 3524-xl
Cisco Nexus 3524-XL Firmware
Cisco Nexus 3548-X/XL Firmware
Cisco Nexus 3548-X/XL
Cisco Nexus 3548-X/XL
Cisco Nexus 36180YC-R Firmware
Cisco Nexus 9232E
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9408
Cisco Nexus 9504 firmware
Cisco Nexus 9508
Cisco Nexus 9516 firmware
All of
Cisco NX-OS
Any of
Cisco MDS 9000 Series Multilayer Switches
Cisco MDS 9100
Cisco MDS 9132T
Cisco MDS 9134
Cisco MDS 9140
Cisco MDS 9148
Cisco MDS 9148S
Cisco MDS 9148T
Cisco MDS 9200
Cisco MDS 9216
Cisco MDS 9216
Cisco MDS 9216
Cisco MDS 9222i
Cisco MDS 9250i
Cisco MDS 9396S
Cisco MDS 9396T
Cisco MDS 9500
Cisco MDS 9500
Cisco MDS 9500
Cisco MDS 9513 Firmware
Cisco MDS 9700
Cisco MDS 9706 Firmware
Cisco MDS 9710 Firmware
Cisco MDS 9718 Firmware
Cisco Nexus 1000V Switch for VMware vSphere
Cisco Nexus 1000V for Hyper-V
Cisco Nexus 1000V
Cisco NX-OS for Nexus 5500 Platform Switches
Cisco Nexus 5548P Firmware
Cisco Nexus 5548UP Firmware
Cisco Nexus 5596T Firmware
Cisco Nexus 5596UP Firmware
Cisco Nexus 5600 Firmware
Cisco 56128p
Cisco Nexus 5624Q Firmware
Cisco Nexus 5648Q Firmware
Cisco Nexus 5672UP-16G
Cisco Nexus 5672UP-16G Firmware
Cisco Nexus 5696Q Firmware
Cisco Nexus 6000 firmware
Cisco Nexus 6001 Firmware
Cisco Nexus 6001P Firmware
Cisco Nexus 6001T Firmware
Cisco Nexus 6004 Firmware
Cisco Nexus 6004X Firmware
Cisco NEXUS 7000 Series Switch
Cisco Nexus 7004 Firmware
Cisco Nexus 7009 Firmware
Cisco Nexus 7010 Firmware
Cisco Nexus 7018 Firmware
Cisco NX-OS=9.3\(11\)
Cisco NX-OS=10.2\(5\)
Cisco Nexus 3048 Firmware
Cisco Nexus 31108PC-V Firmware
Cisco Nexus 31108TC-V Firmware
Cisco Nexus 31128PQ
Cisco Nexus 3132C-Z Firmware
Cisco Nexus 3132Q-V Firmware
Cisco Nexus 3132Q-XL Firmware
Cisco Nexus 3164Q Firmware
Cisco Nexus 3172PQ/PQ-XL
Cisco Nexus 3172PQ-XL Firmware
Cisco Nexus 3172TQ Firmware
Cisco Nexus 3172TQ-XL
Cisco Nexus 3172TQ-XL Firmware
Cisco Nexus 3232
Cisco Nexus 3264C-E Firmware
Cisco Nexus 3264Q Firmware
Cisco Nexus 3408-S Firmware
Cisco Nexus 34180YC Firmware
Cisco Nexus 34200YC-SM Firmware
Cisco Nexus 3432D-S Firmware
Cisco Nexus 3464C Firmware
Cisco Nexus 3524-xl
Cisco Nexus 3524-xl
Cisco Nexus 3524-XL Firmware
Cisco Nexus 3548-X/XL Firmware
Cisco Nexus 3548-X/XL
Cisco Nexus 3548-X/XL
Cisco Nexus 36180YC-R Firmware
Cisco Nexus 9232E
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9408
Cisco Nexus 9504 firmware
Cisco Nexus 9508
Cisco Nexus 9516 firmware
Cisco NX-OS
Cisco MDS 9000 Series Multilayer Switches
Cisco MDS 9100
Cisco MDS 9132T
Cisco MDS 9134
Cisco MDS 9140
Cisco MDS 9148
Cisco MDS 9148S
Cisco MDS 9148T
Cisco MDS 9200
Cisco MDS 9216
Cisco MDS 9216
Cisco MDS 9216
Cisco MDS 9222i
Cisco MDS 9250i
Cisco MDS 9396S
Cisco MDS 9396T
Cisco MDS 9500
Cisco MDS 9500
Cisco MDS 9500
Cisco MDS 9513 Firmware
Cisco MDS 9700
Cisco MDS 9706 Firmware
Cisco MDS 9710 Firmware
Cisco MDS 9718 Firmware
Cisco Nexus 1000V Switch for VMware vSphere
Cisco Nexus 1000V for Hyper-V
Cisco Nexus 1000V
Cisco NX-OS for Nexus 5500 Platform Switches
Cisco Nexus 5548P Firmware
Cisco Nexus 5548UP Firmware
Cisco Nexus 5596T Firmware
Cisco Nexus 5596UP Firmware
Cisco Nexus 5600 Firmware
Cisco 56128p
Cisco Nexus 5624Q Firmware
Cisco Nexus 5648Q Firmware
Cisco Nexus 5672UP-16G
Cisco Nexus 5672UP-16G Firmware
Cisco Nexus 5696Q Firmware
Cisco Nexus 6000 firmware
Cisco Nexus 6001 Firmware
Cisco Nexus 6001P Firmware
Cisco Nexus 6001T Firmware
Cisco Nexus 6004 Firmware
Cisco Nexus 6004X Firmware
Cisco NEXUS 7000 Series Switch
Cisco Nexus 7004 Firmware
Cisco Nexus 7009 Firmware
Cisco Nexus 7010 Firmware
Cisco Nexus 7018 Firmware

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Frequently Asked Questions

  • What is the severity of CVE-2023-20168?

    CVE-2023-20168 is rated as high severity due to its potential to allow an unauthenticated local attacker to cause a device reload.

  • How do I fix CVE-2023-20168?

    To fix CVE-2023-20168, upgrade to the recommended fixed versions of Cisco NX-OS, specifically versions 9.3(11) or 10.2(5).

  • Who is affected by CVE-2023-20168?

    CVE-2023-20168 affects devices running vulnerable Cisco NX-OS Software versions including 9.3(11) and 10.2(5).

  • What impact does CVE-2023-20168 have?

    CVE-2023-20168 can lead to a denial of service by causing a device to unexpectedly reload.

  • Is there a workaround for CVE-2023-20168?

    Currently, there are no known workarounds for CVE-2023-20168; applying the software updates is recommended.

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