CVE-2020-3375: Cisco IOS XE SD-WAN

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

A vulnerability in Cisco SD-WAN Solution Software could allow an unauthenticated, remote attacker to cause a buffer overflow on an affected device. The vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending crafted traffic to an affected device. A successful exploit could allow the attacker to gain access to information that they are not authorized to access, make changes to the system that they are not authorized to make, and execute commands on an affected system with privileges of the root user.

Affected products

• Cisco IOS XE SD-WAN: up to and including 16.9.0; from 16.12.0, up to and including 16.12.4; from 17.2.0, up to and including 17.2.1
• Cisco SD-WAN: up to and including 18.3.0; from 18.4.0, before 18.4.5 (fixed in 18.4.5); from 19.2.0, before 19.2.2 (fixed in 19.2.2); from 19.3.0, before 20.1.1 (fixed in 20.1.1)

Published 2020-07-31. Last modified 2026-06-17.