Vulnerability · Published Aug 25, 2021 · Assigned by cisco

CVE-2021-1588Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability

High 8.6

In plain English

A high-severity security flaw in Cisco NX-OS Software from Cisco. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities).

Severity (CVSS 3.1)8.6High

Exploit odds (30 days)1.3%top 29.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A vulnerability in the MPLS Operation, Administration, and Maintenance (OAM) feature of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper input validation when an affected device is processing an MPLS echo-request or echo-reply packet. An attacker could exploit this vulnerability by sending malicious MPLS echo-request or echo-reply packets to an interface that is enabled for MPLS forwarding on the affected device. A successful exploit could allow the attacker to cause the MPLS OAM process to crash and restart multiple times, causing the affected device to reload and resulting in a DoS condition.

Affected products (as reported)

Vendor	Product	Versions
Cisco	Cisco NX-OS Software	n/a

Weakness: CWE-126 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

References

20210825 Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability vendor-advisory, x_refsource_CISCO