What is CVE-2021-1588?

CVE-2021-1588 is a high-severity vulnerability in Cisco Nx-Os Software, classified under Buffer Over-read. CVSS score: 8.6/10. Published 2021-08-25.

How severe is CVE-2021-1588?

High severity. CVSS v3 base score is 8.6 out of 10.

Is CVE-2021-1588 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Out-of-bounds Read in Cisco Nx-Os Software

CVE-2021-1588

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.

EPSS: 0.013 (68.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

n0-traces/cve_

References

psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1588?: CVE-2021-1588 is a high-severity vulnerability in Cisco Nx-Os Software, classified under Buffer Over-read. CVSS score: 8.6/10. Published 2021-08-25.
How severe is CVE-2021-1588?: High severity. CVSS v3 base score is 8.6 out of 10.
Is CVE-2021-1588 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.