CVE-2020-3381: Cisco SD-WAN Firmware

High severity, CVSS 8.8. EPSS: 2.6% chance of exploitation in the next 30 days.

A vulnerability in the web management interface of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct directory traversal attacks and obtain read and write access to sensitive files on a targeted system. The vulnerability is due to a lack of proper validation of files that are uploaded to an affected device. An attacker could exploit this vulnerability by uploading a crafted file to an affected system. An exploit could allow the attacker to view or modify arbitrary files on the targeted system.

Affected products

• Cisco SD-WAN Firmware: up to and including 18.3.0; from 18.4.0, before 19.2.3 (fixed in 19.2.3); from 19.3.0, up to and including 20.1

Published 2020-07-16. Last modified 2026-06-17.