Cisco Catalyst SD-WAN Authentication Bypass Vulnerability (CVE-2026-20127)

The following is a summary of key information from this vulnerability advisory: Vulnerability Overview - Vulnerability Name: Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability - Severity: Critical - CVE ID: CVE-2026-20127 - CWE: CWE-287 Affected Products - Cisco Catalyst SD-WAN Controller (formerly SD-WAN vSmart) - Cisco Catalyst SD-WAN Manager (formerly SD-WAN vManage) Vulnerability Description - This vulnerability exists in the peer authentication mechanism of the affected systems, which does not function correctly. An attacker can exploit this vulnerability by sending a crafted request to log in to the affected Cisco Catalyst SD-WAN Controller, thereby obtaining an internal, high-privilege, non-root user account. Using this account, the attacker can access NETCONF and manipulate network configurations within the SD-WAN fabric. Remediation - Cisco has released software updates to address this vulnerability. - There are no workarounds available to mitigate this vulnerability. - Cisco recommends that customers upgrade to the following patched versions and change the default administrator password. References and Advisories - This advisory is accessible at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk - For information on Cisco's policies and publications regarding product security vulnerability disclosure and advisories, please refer to the Vulnerability Policy below. This document also includes instructions for obtaining remediation software and receiving Cisco security vulnerability information, including vulnerability assessment and mitigation guidance. - Any customers with additional questions regarding the aforementioned vulnerability and advisory may contact the Cisco Technical Assistance Center (TAC). - The source of this vulnerability is the Australian Signals Directorate's Australian Cyber Security Centre.

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Cisco Catalyst SD-WAN Authentication Bypass Vulnerability (CVE-2026-20127)