CVE-2026-20210: Cisco Catalyst SD-WAN Manager

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A vulnerability in the web UI of Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, could allow an authenticated, remote attacker with read-only permissions to modify configurations and perform unauthorized actions on an affected system. This vulnerability exists because of a failure to redact sensitive information within device configurations and templates. An attacker could exploit this vulnerability by elevating their read-only permissions to those of a high-privileged user. A successful exploit could allow the attacker to access or modify configuration settings within Cisco Catalyst SD-WAN Manager as a high-privileged user.

Affected products

• Cisco Catalyst SD-WAN Manager: before 20.9.9.1 (fixed in 20.9.9.1); from 20.10, before 20.12.5.4 (fixed in 20.12.5.4); from 20.12.6, before 20.12.6.2 (fixed in 20.12.6.2); from 20.13, before 20.15.4.4 (fixed in 20.15.4.4); from 20.15.5, before 20.15.5.2 (fixed in 20.15.5.2); from 20.16, before 20.18.2.2 (fixed in 20.18.2.2); …

Published 2026-05-14. Last modified 2026-06-29.