CVE-2026-20129
CRITICALCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2Description
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.
Analysis
Authentication bypass in Cisco Catalyst SD-WAN Manager API allows unauthenticated remote access to the management platform. Separate vulnerability from the peering auth bypass (CVE-2026-20127).
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Remediation
Within 24 hours: Isolate affected SD-WAN Manager instances from untrusted networks and restrict API access to known administrator IP ranges. Within 7 days: Implement network segmentation to limit lateral movement if compromise occurs, and enable comprehensive API logging and monitoring for suspicious authentication attempts. …
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