high
7.4
CWE
190
Advisory Published
Updated

CVE-2020-3120: Cisco FXOS, IOS XR, and NX-OS Software Cisco Discovery Protocol Denial of Service Vulnerability

First published: Wed Feb 05 2020(Updated: )

A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing check when the affected software processes Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to exhaust system memory, causing the device to reload. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Firepower Extensible Operating System<=2.3.1.173
Cisco Firepower Extensible Operating System>=2.6<2.6.1.187
Cisco Firepower Extensible Operating System>=2.7<2.7.1.106
Cisco FX-OS=2.4
Cisco Firepower 4110 Next-Generation Firewall
Cisco Firepower 4115
Cisco Firepower 4120 Next-Generation Firewall
Cisco Firepower 4125 firmware
Cisco Firepower 4140 Next-Generation Firewall
Cisco Firepower 4145 firmware
Cisco Firepower 4150 Next-Generation Firewall
Cisco Firepower 9300 firmware
Cisco IOS XRv 9000=5.2.5
Cisco NCS 6000
Cisco IOS XRv 9000=6.4.2
Cisco ASR 9000v-v2
Cisco ASR 9001
Cisco ASR 9006 Router
Cisco ASR 9010 Router
Cisco ASR 9901-RP Firmware
Cisco ASR 9904
Cisco ASR 9906
Cisco ASR 9910
Cisco ASR 9912
Cisco ASR 9922
Cisco Carrier Routing System
Cisco IOS XRv 9000=6.5.3
Cisco NCS 5001 Firmware
Cisco NCS 5002
Cisco NCS 5011
Cisco NCS 540-12Z20G-SYS-A
Cisco NCS 540-12Z20G-SYS-D
Cisco NCS 540
Cisco NCS 540-28Z4C-SYS-A
Cisco NCS 540-28Z4C-SYS-D
Cisco NCS 540
Cisco NCS 540X-12Z16G-SYS-A
Cisco NCS 540X-12Z16G-SYS-D
Cisco NCS 540X-16Z4G8Q2C-A/D
Cisco NCS 540X-16Z4G8Q2C-A/D
Cisco NCS 540
Cisco NCS 5501-SE
Cisco NCS 5501-SE
Cisco NCS 5502
Cisco NCS 5502-SE Firmware
Cisco NCS 5508
Cisco NCS 5516
Cisco NCS 560-4
Cisco IOS XRv 9000
Cisco IOS XRv 9000=6.6.25
Cisco IOS XRv 9000=7.0.1
Cisco NCS 540
Cisco NX-OS>=5.2<6.2\(29\)
Cisco NX-OS>=7.3<8.4\(1a\)
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 NX-OS>=5.2<5.2\(1\)sv5\(1.3\)
Cisco Nexus 1000V for VMware vSphere
Cisco NX-OS<=5.2
Cisco Nexus 1000V for Hyper-V
Cisco NX-OS<5.2\(1\)sv3\(4.1b\)
Cisco Nexus 1000V
Cisco NX-OS>=7.0\(3\)f2<9.3\(2\)
Cisco NX-OS>=7.0\(3\)i<7.0\(3\)i7\(8\)
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 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
Cisco NX-OS<7.3\(6\)n1\(1\)
Cisco Nexus 5548P Firmware
Cisco Nexus 5548UP Firmware
Cisco Nexus 5596T Firmware
Cisco Nexus 5596UP Firmware
Cisco 56128p
Cisco Nexus 5624Q Firmware
Cisco Nexus 5648Q Firmware
Cisco Nexus 5672UP-16G
Cisco Nexus 5696Q Firmware
Cisco NX-OS<6.2\(24\)
Cisco NX-OS>=7.2<7.3\(5\)d1\(1\)
Cisco NX-OS>=8.0<8.2\(5\)
Cisco NX-OS>=8.3<8.4\(2\)
Cisco Nexus 7000
Cisco Nexus 7700 series
Cisco NX-OS<13.2\(9b\)
Cisco NX-OS>=14.0<14.2\(1j\)
Cisco UCS Manager<3.2\(3m\)
Cisco UCS Manager>=4.0<4.0\(4g\)
Cisco UCS 6248UP
Cisco UCS 6296UP
Cisco UCS 6300 firmware
Cisco UCS 6324 firmware
Cisco UCS 64108
Cisco UCS 6454 Fabric Interconnect

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-3120?

    CVE-2020-3120 has been classified with a high severity level due to its potential to cause a denial of service (DoS).

  • How do I fix CVE-2020-3120?

    To mitigate CVE-2020-3120, upgrade affected Cisco FXOS, IOS XR, or NX-OS software to a version that includes the security fix.

  • What products are affected by CVE-2020-3120?

    CVE-2020-3120 affects Cisco FXOS, IOS XR, and NX-OS software on specific versions, including Cisco Firepower Extensible Operating System.

  • Can CVE-2020-3120 be exploited remotely?

    CVE-2020-3120 cannot be exploited remotely as it requires an unauthenticated adjacent attacker.

  • What impact does CVE-2020-3120 have on network devices?

    CVE-2020-3120 can cause a device reload leading to a denial of service, affecting network availability.

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