CVE-2021-1587

Cisco NX-OS Software VXLAN OAM (NGOAM) Denial of Service Vulnerability

State: Published
Severity: 8.6 High
Published: Aug 25, 2021
Updated: Nov 7, 2024
Reserved: Nov 13, 2020

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.6 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	cisco

Weaknesses

CWE-115

Affected Products

Product	Versions
Cisco NX-OS SoftwareCisco	n/aAffected

References

20210825 Cisco NX-OS Software VXLAN OAM (NGOAM) Denial of Service Vulnerabilityvendor-advisory

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