What is CVE-2021-1614?

CVE-2021-1614 is a medium-severity vulnerability in Cisco Sd-Wan Solution, classified under Buffer Over-read. CVSS score: 5.3/10. Published 2021-07-22.

How severe is CVE-2021-1614?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Cisco Sd-Wan Solution

CVE-2021-1614

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.

Published 2021-07-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdw-mpls… (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2021-1614?: CVE-2021-1614 is a medium-severity vulnerability in Cisco Sd-Wan Solution, classified under Buffer Over-read. CVSS score: 5.3/10. Published 2021-07-22.
How severe is CVE-2021-1614?: Medium severity. CVSS v3 base score is 5.3 out of 10.