CVE-2021-1614

Name: CVE-2021-1614
Creator: NVD / NIST
Published: 2021-07-22T16:15:08.667+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.19%

Last modified Jun 17, 2026

CVE-2021-1614 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. A vulnerability in the Multiprotocol Label Switching (MPLS) packet handling function of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to gain access to information stored in MPLS buffer memory. This vulnerability is due to insufficient handling of malformed MPLS packets that are processed by a device that is running Cisco SD-WAN Software. EPSS estimates a 1.19% chance of exploitation in the next 30 days.

Description

A vulnerability in the Multiprotocol Label Switching (MPLS) packet handling function of Cisco SD-WAN Software could allow an unauthenticated, remote attacker to gain access to information stored in MPLS buffer memory. This vulnerability is due to insufficient handling of malformed MPLS packets that are processed by a device that is running Cisco SD-WAN Software. An attacker could exploit this vulnerability by sending a crafted MPLS packet to an affected device that is running Cisco SD-WAN Software or Cisco SD-WAN vManage Software. A successful exploit could allow the attacker to gain unauthorized access to sensitive information.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability

1.19%

64.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-126

Affected Software

Vendor	Product	Versions
Cisco	Sd-Wan	>= 18.4.0, < 18.4.6
Cisco	Sd-Wan	>= 19.2.0, < 19.2.3
Cisco	Sd-Wan	>= 20.3, < 20.3.2
Cisco	Sd-Wan	>= 20.4, < 20.4.1
Cisco	Sd-Wan	>= 20.5, < 20.5.1

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-mpls-infodisclos-MSSRFkZqPatch, Vendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-mpls-infodisclos-MSSRFkZqPatch, Vendor Advisory

Timeline

Published: Jul 22, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1614?

How severe is CVE-2021-1614?

CVE-2021-1614 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1614?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-1614?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST