CVE-2026-20127

Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability

Severity: critical
CVSS v3: 10
EPSS percentile: 100%
Known exploited: yes (CISA KEV)
Vendor: Cisco
Product: Catalyst SD-WAN Controller and Manager
Published: 2026-02-25
Modified: 2026-06-17

Description

A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, 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 w

NVD record

Informational only. Not a warranty of security, completeness or fitness for any purpose. Derived from NVD, CISA KEV, FIRST.org EPSS and vendor advisories (CVE Program List v5); those sources change continuously and may be incomplete or incorrect. Verify every remediation against the vendor advisory before acting. Absence of a finding is not evidence that no vulnerability exists. Not endorsed by NVD, CISA, FIRST or any vendor named.

Raw record

{
  "id": "CVE-2026-20127",
  "title": "Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability",
  "description": "A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, and Cisco Catalyst SD-WAN Validator, formerly SD-WAN vBond, could allow an unauthenticated, remote attacker to bypass authentication and obtain administrative privileges on an affected system.\r\n\r\nThis 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&nbsp;user account. Using this account, the attacker could access NETCONF, which w",
  "severity": "critical",
  "cvss": 10,
  "epss": 100,
  "kev": 1,
  "vendor": "Cisco",
  "product": "Catalyst SD-WAN Controller and Manager",
  "published": "2026-02-25",
  "modified": "2026-06-17T15:06:12.607",
  "source": "nvd",
  "remediation": [],
  "disclaimer": "Informational only. Not a warranty of security, completeness or fitness for any purpose. Derived from NVD, CISA KEV, FIRST.org EPSS and vendor advisories (CVE Program List v5); those sources change continuously and may be incomplete or incorrect. Verify every remediation against the vendor advisory before acting. Absence of a finding is not evidence that no vulnerability exists. Not endorsed by NVD, CISA, FIRST or any vendor named."
}