CVE-2026-20210: Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-10-26
Weakness: CWE-779

Description

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; from 20.10 before 20.12.5.4; from 20.12.6 before 20.12.6.2; from 20.13 before 20.15.4.4; from 20.15.5 before 20.15.5.2; from 20.16 before 20.18.2.2 — fixed in 20.9.9.1, 20.12.5.4, 20.12.6.2, 20.15.4.4, 20.15.5.2, 20.18.2.2

How to fix

Upgrade to a fixed version: Cisco Catalyst SD-WAN Manager 20.9.9.1, 20.12.5.4, 20.12.6.2, 20.15.4.4. Check the vendor advisory for mitigations.

References

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