CVE-2021-1612: Cisco SD-WAN

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in the Cisco IOS XE SD-WAN Software CLI could allow an authenticated, local attacker to overwrite arbitrary files on the local system. This vulnerability is due to improper access controls on files within the local file system. An attacker could exploit this vulnerability by placing a symbolic link in a specific location on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on an affected device.

Affected products

• Cisco SD-WAN: before 17.3.4 (fixed in 17.3.4)

Published 2021-09-23. Last modified 2026-06-17.