Exploited vulnerability

CVE-2026-20127

TLP:CLEAR

Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability

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.

Facts

Vendor: Cisco
Product: Catalyst SD-WAN Controller and Manager
CVSS: 10
EPSS (probability of exploitation within 30 days): 89.3 %
On CISA's Known Exploited Vulnerabilities list since: 25 February 2026
First known exploitation: 25 February 2026
CISA's deadline for US federal agencies: 27 February 2026
Weakness: CWE-287
First seen by Risk Letters: 25 February 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD