CVE-2026-20127
Cisco Catalyst SD-WAN Controller 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. 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.
Weakness: CWE-287
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco Catalyst SD-WAN Manager | Network & Security Management | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco Catalyst SD-WAN Manager
Vendor advisory
Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability
Cisco’s rating: Critical (advisory CVSS 10.0) · Published Feb 25, 2026 · updated Jun 16, 2026 (revision 2.0)
Bug ID: CSCws52722
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from