CVE-2026-20127: Cisco Catalyst SD-WAN Controller and Manager

EPSS88.4%No. 491 of 1739 in KEV

CVE year2026listed the same year

Same vendor in KEV100

Same product1

Field	Value
Vendor	Cisco
Product	Catalyst SD-WAN Controller and Manager
Name	Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability
Added to KEV	2026-02-25
US federal due date	2026-02-27
Ransomware use	Unknown
CWE	CWE-287

CISA description

Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, contain an authentication bypass vulnerability could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system. This vulnerability exists because the peering authentication mechanism in an affected system is not working properly. An attacker could exploit this vulnerability by sending crafted requests to an affected system. A successful exploit could allow the attacker to log in to an affected Cisco Catalyst SD-WAN Controller as an internal, high-privileged, non-root user account. Using this account, the attacker could access NETCONF, which would then allow the attacker to manipulate network configuration for the SD-WAN fabric.

NVD — CVE-2026-20127

Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.

About this page

A Cisco Catalyst SD-WAN Controller and Manager vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2026-02-25.