CVE-2021-1614: Cisco SD-WAN

Medium severity, CVSS 5.3. EPSS: 1.2% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco SD-WAN: from 18.4.0, before 18.4.6 (fixed in 18.4.6); from 19.2.0, before 19.2.3 (fixed in 19.2.3); from 20.3, before 20.3.2 (fixed in 20.3.2); from 20.4, before 20.4.1 (fixed in 20.4.1); from 20.5, before 20.5.1 (fixed in 20.5.1)

Published 2021-07-22. Last modified 2026-06-17.