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 (12)

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 WORKING POC 1 stars
by sfewer-r7 · remote
https://github.com/sfewer-r7/CVE-2026-20127
nomisec WRITEUP 1 stars
by yonathanpy · poc
https://github.com/yonathanpy/CVE-2026-20127-Cisco-SD-WAN-Preauth-RCE
nomisec SCANNER
by gigachadusers · poc
https://github.com/gigachadusers/cve-2026-20127
nomisec SCANNER
by abrahamsurf · poc
https://github.com/abrahamsurf/sdwan-scanner-CVE-2026-20127
nomisec WORKING POC
by BugFor-Pings · poc
https://github.com/BugFor-Pings/CVE-2026-20127_EXP
nomisec WORKING POC
by leemuun · poc
https://github.com/leemuun/CVE-2026-20127
nomisec WRITEUP
by randeepajayasekara · poc
https://github.com/randeepajayasekara/CVE-2026-20127
nomisec WRITEUP
by bluefalconink · poc
https://github.com/bluefalconink/cisa-ed-26-03-tracker
nomisec SUSPICIOUS
by Dimchuk · poc
https://github.com/Dimchuk/CVE-2026-20127-chain
metasploit WORKING POC
by sfewer-r7 · rubypoc
https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/admin/networking/cisco_sdwan_auth_bypass.rb

Scores

CVSS v3 10.0
EPSS 0.3331
EPSS Percentile 96.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Details

CISA KEV 2026-02-25
VulnCheck KEV 2026-02-25
ENISA EUVD EUVD-2026-8675
CWE
CWE-287
Status published
Products (4)
cisco/catalyst_sd-wan_manager 20.12.6
cisco/catalyst_sd-wan_manager < 20.9.8.2
cisco/sd-wan_vsmart_controller 20.12.6
cisco/sd-wan_vsmart_controller < 20.9.8.2
Published Feb 25, 2026
KEV Added Feb 25, 2026
Tracked Since Feb 26, 2026