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.

Vulnerability/
CVE-2021-1587

high

8.6

CWE

436 115

25/8/2021

7/11/2024

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

First published: Wed 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.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
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

Remedy

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

Never miss a vulnerability like this again

Reference Links

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

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.