CVE-2026-20127

CRITICAL KEV

Cisco Catalyst SD-WAN - Auth Bypass

Title source: llm

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. 

Exploits (8)

github SUSPICIOUS 10 stars
by XiaomingX · pythonpoc
https://github.com/XiaomingX/data-cve-poc-py-v1/tree/main/2026/CVE-2026-20127
nomisec WORKING POC 2 stars
by zerozenxlabs · remote
https://github.com/zerozenxlabs/CVE-2026-20127---Cisco-SD-WAN-Preauth-RCE
nomisec WRITEUP 1 stars
by yonathanpy · poc
https://github.com/yonathanpy/CVE-2026-20127-Cisco-SD-WAN-Preauth-RCE
nomisec WORKING POC
by BugFor-Pings · poc
https://github.com/BugFor-Pings/CVE-2026-20127_EXP
nomisec SUSPICIOUS
by Dimchuk · poc
https://github.com/Dimchuk/CVE-2026-20127-chain
nomisec SCANNER
by abrahamsurf · poc
https://github.com/abrahamsurf/sdwan-scanner-CVE-2026-20127
nomisec WRITEUP
by bluefalconink · poc
https://github.com/bluefalconink/cisa-ed-26-03-tracker
nomisec WORKING POC
by leemuun · poc
https://github.com/leemuun/CVE-2026-20127

Scores

CVSS v3 10.0
EPSS 0.0260
EPSS Percentile 85.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitation Intel

CISA KEV 2026-02-25
VulnCheck KEV 2026-02-25
ENISA EUVD EUVD-2026-8675

Classification

CWE
CWE-287
Status published

Affected Products (4)

cisco/catalyst_sd-wan_manager < 20.9.8.2
cisco/catalyst_sd-wan_manager
cisco/sd-wan_vsmart_controller < 20.9.8.2
cisco/sd-wan_vsmart_controller

Timeline

Published Feb 25, 2026
KEV Added Feb 25, 2026
Tracked Since Feb 26, 2026