CVE-2021-1587: Cisco NX-OS Software VXLAN OAM (NGOAM) Denial of Service Vulnerability

Published Aug 25, 2021

Updated

A vulnerability in the VXLAN Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software, known as NGOAM, could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper handling of specific packets with a Transparent Interconnection of Lots of Links (TRILL) OAM EtherType. An attacker could exploit this vulnerability by sending crafted packets, including the TRILL OAM EtherType of 0x8902, to a device that is part of a VXLAN Ethernet VPN (EVPN) fabric. A successful exploit could allow the attacker to cause an affected device to experience high CPU usage and consume excessive system resources, which may result in overall control plane instability and cause the affected device to reload. Note: The NGOAM feature is disabled by default.

Affected Software

63 affected components

Cisco NX-OS

Cisco Nexus 3000

Cisco Nexus 3048

Cisco Nexus 31108pc-v

Cisco Nexus 31108tc-v

Cisco Nexus 31128pq

Cisco Nexus 3132c-z

Cisco Nexus 3132q-v

Cisco Nexus 3132q-x\/3132q-xl

Cisco Nexus 3164q

Cisco Nexus 3172pq\/pq-xl

Cisco Nexus 3172tq-xl

Cisco Nexus 3232c

Cisco Nexus 3264c-e

Cisco Nexus 3264q

Cisco Nexus 3408-s

Cisco Nexus 34180yc

Cisco Nexus 3432d-s

Cisco Nexus 3464c

Cisco Nexus 3524-x\/xl

Cisco Nexus 3548-x\/xl

Cisco Nexus 36180yc-r

Cisco Nexus 3636c-r

Cisco Nexus 9000v

Cisco Nexus 92160yc-x

Cisco Nexus 92300yc

Cisco Nexus 92304qc

Cisco Nexus 92348gc-x

Cisco Nexus 9236c

Cisco Nexus 9272q

Cisco Nexus 93108tc-ex

Cisco Nexus 93108tc-ex-24

Cisco Nexus 93108tc-fx

Cisco Nexus 93108tc-fx-24

Cisco Nexus 93108tc-fx3p

Cisco Nexus 93120tx

Cisco Nexus 93128tx

Cisco Nexus 9316d-gx

Cisco Nexus 93180lc-ex

Cisco Nexus 93180yc-ex

Cisco Nexus 93180yc-ex-24

Cisco Nexus 93180yc-fx

Cisco Nexus 93180yc-fx-24

Cisco Nexus 93180yc-fx3

Cisco Nexus 93180yc-fx3s

Cisco Nexus 93216tc-fx2

Cisco Nexus 93240yc-fx2

Cisco Nexus 9332c

Cisco Nexus 9332pq

Cisco Nexus 93360yc-fx2

Cisco Nexus 9336c-fx2

Cisco Nexus 9336c-fx2-e

Cisco Nexus 9348gc-fxp

Cisco Nexus 93600cd-gx

Cisco Nexus 9364c

Cisco Nexus 9364c-gx

Cisco Nexus 9372px

Cisco Nexus 9372px-e

Cisco Nexus 9372tx

Cisco Nexus 9372tx-e

Cisco Nexus 9396px

Cisco Nexus 9396tx

Cisco Nexus 9508

Remediation

Patch Available

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-nxos-ngoam-dos-LTDb9Hv

Event History

Aug 25, 2021

CVE Published

via MITRE·07:11 PM

Data Sourced

via MITRE·07:11 PM

DescriptionSeverityWeakness

Frequently Asked Questions

What is CVE-2021-1587?

CVE-2021-1587 is a vulnerability in the VXLAN Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software that could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition on an affected device.

What is the severity of CVE-2021-1587?

CVE-2021-1587 has a severity rating of 8.6, which is considered high.

Which devices are affected by CVE-2021-1587?

Cisco Nexus devices running Cisco NX-OS Software are affected by CVE-2021-1587.

How can an attacker exploit CVE-2021-1587?

An attacker can exploit CVE-2021-1587 by sending specially crafted packets to a vulnerable device.

Is there a fix for CVE-2021-1587?

Yes, Cisco has released software updates to address the vulnerability. It is recommended to apply the necessary updates as soon as possible.