SB2026022553 - Authentication Bypass in Cisco Catalyst SD-WAN Controller
Published: February 25, 2026
Security Bulletin ID
SB2026022553
Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Improper authentication (CVE-ID: CVE-2026-20127)
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.