CVE-2026-20129
A vulnerability in the API user authentication of Cisco Catalyst SD-WAN Manager could allow an unauthenticated, remote attacker to gain access to an affected system as a user who has the netadmin role. The vulnerability is due to improper authentication for requests that are sent to the API. An attacker could exploit this vulnerability by sending a crafted request to the API of an affected system. A successful exploit could allow the attacker to execute commands with the privileges of the netadmin role. Note: Cisco Catalyst SD-WAN Manager releases 20.18 and later are not affected by this vulnerability.
- Published Feb 25, 2026
- CVSS 9.8 critical
- 0.7% chance of exploitation in the next 30 days (EPSS)
Affected software
In the news
- Cisco Zero-Day Highlights API Endpoint Authentication Issues Dark Reading ·
- Herding Cats: Recent Cisco SD-WAN Manager Vulnerabilities VulnCheck Blog ·