SB2026022553 - Authentication Bypass in Cisco Catalyst SD-WAN Controller

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Main Vulnerability Database SB2026022553

SB2026022553 - Authentication Bypass in Cisco Catalyst SD-WAN Controller

Published: February 25, 2026 Updated: April 2, 2026

Security Bulletin ID SB2026022553
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper authentication (CVE-ID: CVE-2026-20127)

CWE-ID: CWE-287 - Improper Authentication

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red


The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in authentication mechanism. A remote non-authenticated attacker can send specially crafted requests to bypass authentication process and access NETCONF, which would then allow to manipulate network configuration for the SD-WAN fabric.

Note, the vulnerability is being actively exploited in the wild. 


Remediation

Install update from vendor's website.

References