medium
4.7
CWE
345
Advisory Published
Updated

CVE-2020-3174: Cisco NX-OS Software Anycast Gateway Invalid ARP Vulnerability

First published: Wed Feb 26 2020(Updated: )

A vulnerability in the anycast gateway feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a device to learn invalid Address Resolution Protocol (ARP) entries. The ARP entries are for nonlocal IP addresses for the subnet. The vulnerability is due to improper validation of a received gratuitous ARP (GARP) request. An attacker could exploit this vulnerability by sending a malicious GARP packet on the local subnet to cause the ARP table on the device to become corrupted. A successful exploit could allow the attacker to populate the ARP table with incorrect entries, which could lead to traffic disruptions.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco NX-OS=8.1\(1\)
Cisco NX-OS=8.4\(1\)
Cisco NX-OS=9.3\(1\)
Cisco MDS 9132T
Cisco MDS 9148S
Cisco MDS 9148T
Cisco MDS 9216
Cisco MDS 9216
Cisco MDS 9216
Cisco MDS 9222i
Cisco MDS 9500
Cisco MDS 9500
Cisco MDS 9513 Firmware
Cisco MDS 9706 Firmware
Cisco MDS 9710 Firmware
Cisco MDS 9718 Firmware
Cisco Nexus 3016Q Firmware
Cisco Nexus 3048 Firmware
Cisco Nexus 3064 Firmware
Cisco Nexus 3064
Cisco Nexus 31108PC-V Firmware
Cisco Nexus 31108TC-V Firmware
Cisco Nexus 31128PQ
Cisco Nexus 3132C-Z Firmware
Cisco Nexus 3132Q-XL
Cisco Nexus 3132Q-V Firmware
Cisco Nexus 3132Q-XL Firmware
Cisco Nexus 3164Q Firmware
Cisco Nexus 3172 Firmware
Cisco Nexus 3172PQ-XL Firmware
Cisco Nexus 3172TQ Firmware
Cisco Nexus 3172TQ-XL
Cisco Nexus 3172TQ-XL Firmware
Cisco Nexus 3232C
Cisco Nexus 3264C-E Firmware
Cisco Nexus 3264Q Firmware
Cisco Nexus 3408-S Firmware
Cisco Nexus 34180YC 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 3636C-R Firmware
Cisco Nexus 7000
Cisco Nexus 7700 series
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-FX Switch
Cisco Nexus 93120TX Firmware
Cisco Nexus 93128 Firmware
Cisco Nexus 93180LC-EX Switch
Cisco Nexus 93180YC-EX-24
Cisco Nexus 93180YC-FX 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 N9336PQ-X
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 9364c-h1
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 9504 firmware
Cisco Nexus 9508
Cisco Nexus 9516 firmware

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-3174?

    The severity of CVE-2020-3174 is rated as high, given its potential impact on network integrity.

  • How do I fix CVE-2020-3174?

    To fix CVE-2020-3174, update the affected Cisco NX-OS Software versions to the latest recommended versions provided by Cisco.

  • Which Cisco NX-OS versions are affected by CVE-2020-3174?

    CVE-2020-3174 affects Cisco NX-OS versions 8.1(1), 8.4(1), and 9.3(1).

  • Can CVE-2020-3174 be exploited remotely?

    No, CVE-2020-3174 requires an unauthenticated adjacent attacker to exploit the vulnerability.

  • What type of attacks can CVE-2020-3174 enable?

    CVE-2020-3174 can enable attackers to cause a device to learn invalid ARP entries, leading to potential traffic interception or denial of service.

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