What is CVE-2020-3397?

CVE-2020-3397 is a vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.

Which devices are affected by CVE-2020-3397?

Cisco Nexus devices running Cisco NX-OS Software are affected by CVE-2020-3397.

How severe is CVE-2020-3397?

CVE-2020-3397 has a severity rating of 8.6 (high).

How can I fix CVE-2020-3397?

To fix CVE-2020-3397, Cisco recommends upgrading to a fixed software release.

Where can I find more information about CVE-2020-3397?

More information about CVE-2020-3397 can be found on the Cisco Security Advisory page.

Vulnerability/
CVE-2020-3397

high

8.6

CWE

27/8/2020

13/11/2024

CVE-2020-3397: Cisco NX-OS Software Border Gateway Protocol Multicast VPN Denial of Service Vulnerability

First published: Thu Aug 27 2020(Updated: )

A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of a specific type of BGP MVPN update message. An attacker could exploit this vulnerability by sending this specific, valid BGP MVPN update message to a targeted device. A successful exploit could allow the attacker to cause one of the BGP-related routing applications to restart multiple times, leading to a system-level restart. Note: The Cisco implementation of BGP accepts incoming BGP traffic from only explicitly configured peers. To exploit this vulnerability, an attacker must send a specific BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer. To do so, the attacker must obtain information about the BGP peers in the trusted network of the affected system.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco NX-OS
Cisco Nexus 3016Q Firmware
Cisco Nexus 3048 Firmware
Cisco Nexus 3064x
Cisco Nexus 3064
Cisco Nexus 31108PV-V
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-X/3132Q-XL
Cisco Nexus 3164Q Firmware
Cisco Nexus 3172
Cisco Nexus 3172PQ/PQ-XL
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-x/xl
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 92160YC Switch
Cisco Nexus 92300YC Switch
Cisco Nexus 92304qc
Cisco Nexus 92348GC-X Switch
Cisco Nexus 9236c
Cisco Nexus 9272Q Switch
Cisco Nexus Series
Cisco Nexus 93108TC-FX Switch
Cisco Nexus 93120tx
Cisco Nexus 93128tx
Cisco Nexus 93180LC-EX Switch
Cisco Nexus 93180YC-EX
Cisco Nexus 93180YC-FX Firmware
Cisco Nexus 93216TC-FX2 Firmware
Cisco Nexus 93240YC-FX2 Firmware
Cisco Nexus 9332C Firmware
Cisco Nexus 9332pq
Cisco Nexus 93360YC-FX2
Cisco Nexus 9336C-FX2 Firmware
Cisco Nexus N9336PQ-X
Cisco Nexus 9348GC-FXP Firmware
Cisco Nexus 9364C-GX Firmware
Cisco Nexus 9372px
Cisco Nexus 9372PX-E Switch
Cisco Nexus 9372tx
Cisco Nexus 9372TX-E Switch
Cisco Nexus 9396px
Cisco Nexus 9396tx
Cisco Nexus 9504
Cisco Nexus 9508
Cisco Nexus 9516

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxosbgp-nlri-dos-458rG2OQ

Frequently Asked Questions

What is CVE-2020-3397?
CVE-2020-3397 is a vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
Which devices are affected by CVE-2020-3397?
Cisco Nexus devices running Cisco NX-OS Software are affected by CVE-2020-3397.
How severe is CVE-2020-3397?
CVE-2020-3397 has a severity rating of 8.6 (high).
How can I fix CVE-2020-3397?
To fix CVE-2020-3397, Cisco recommends upgrading to a fixed software release.
Where can I find more information about CVE-2020-3397?
More information about CVE-2020-3397 can be found on the Cisco Security Advisory page.