What is CVE-2026-20129?

CVE-2026-20129 is a critical-severity vulnerability in Cisco Catalyst Sd-wan Manager, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-02-25.

How severe is CVE-2026-20129?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Auth bypass in Cisco Catalyst Sd-wan Manager

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 i…

Vulnerability class: Broken Authentication

EPSS: 0.001 (22.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cisco Catalyst Sd-wan Manager — versions 20.1.12, 19.2.1, 18.4.4

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

cisco-sa-sdwan-authbp-qwCX8D4v

Frequently asked questions

What is CVE-2026-20129?: CVE-2026-20129 is a critical-severity vulnerability in Cisco Catalyst Sd-wan Manager, classified under Improper Authentication. CVSS score: 9.8/10. Published 2026-02-25.
How severe is CVE-2026-20129?: Critical severity. CVSS v3 base score is 9.8 out of 10.