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CRITICAL CVSS 10.0 (v3.1) cisco

CVE-2026-20127 — Cisco Cisco Catalyst SD-WAN Manager vulnerability

Published 25/02/2026 Source : ENISA EUVD

Description

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. 

Impacts

  • This vulnerability is actively exploited in the wild. Exploited since: 2026-02-25.

Solutions

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-rpa-EHchtZk
https://nvd.nist.gov/vuln/detail/CVE-2026-20127
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20127

Affected Products (1)

Cisco Catalyst SD-WAN Manager
Affected versions : 18.3.7

Vulnerabilities (CVE) (1)

CVE-2026-20127

Information

Severity
CRITICAL
CVSS v3.1
10.0 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Risk Indicators
✓ Exploit in Wild ? PoC Public ✗ CISA KEV ? Patch Available ? Workaround
Source
ENISA EUVD cisco
External Link
View Source ↗
Published
25/02/2026
Officially Updated
25/02/2026
Added to OpenVOC
11/03/2026 00:43
Last updated
11/03/2026 00:45
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