CVE Vulnerabilities

CVE-2026-20127

Improper Authentication

Published: Feb 25, 2026 | Modified: Feb 26, 2026
CVSS 3.x
10
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
Ubuntu
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A vulnerability in the peering authentication in Cisco Catalyst SD-WAN Controller, formerly SD-WAN vSmart, and Cisco Catalyst SD-WAN Manager, formerly SD-WAN vManage, 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

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected Software

NameVendorStart VersionEnd Version
Catalyst_sd-wan_managerCisco*20.9.8.2 (excluding)
Catalyst_sd-wan_managerCisco20.11 (including)20.12.5.3 (excluding)
Catalyst_sd-wan_managerCisco20.13 (including)20.15.4.2 (excluding)
Catalyst_sd-wan_managerCisco20.16 (including)20.18.2.1 (excluding)
Catalyst_sd-wan_managerCisco20.12.6 (including)20.12.6 (including)
Sd-wan_vsmart_controllerCisco*20.9.8.2 (excluding)
Sd-wan_vsmart_controllerCisco20.11 (including)20.12.5.3 (excluding)
Sd-wan_vsmart_controllerCisco20.13 (including)20.15.4.2 (excluding)
Sd-wan_vsmart_controllerCisco20.16 (including)20.18.2.1 (excluding)
Sd-wan_vsmart_controllerCisco20.12.6 (including)20.12.6 (including)

Potential Mitigations

References