CVE-2026-20122: Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability

Medium severity, CVSS 5.4. Actively exploited: in CISA KEV since 2026-04-20. EPSS: 25% chance of exploitation in the next 30 days.

A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.

Affected products

• Cisco Catalyst SD-WAN Manager: before 20.9.8.2 (fixed in 20.9.8.2); from 20.10, before 20.12.5.3 (fixed in 20.12.5.3); from 20.13, before 20.15.4.2 (fixed in 20.15.4.2); from 20.16, before 20.18.2.1 (fixed in 20.18.2.1); version 20.12.6 only

Published 2026-02-25. Last modified 2026-06-17.