CVE-2026-20127

Cisco Catalyst SD-WAN Controller and Manager Authentication Bypass Vulnerability

Cisco Catalyst SD-WAN Controller and ManagerNetwork & edge

CVSS

10.0Critical

ExploitationExploited in the wildAdded to KEV 25 Feb 2026CISA KEV

Exploit odds (EPSS)89.3%Chance of exploitation activity in the next 30 days, higher than 99% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed inNone listedNo source names a fixed version. Check the vendor advisory below

Federal deadline27 Feb 2026Remediation due date for US federal agenciesCISA KEV

CISA required actionPlease adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

25 Feb 2026Exploit code publicMetasploit
25 Feb 2026Added to CISA KEVCISA KEV
25 Feb 2026, 16:14 UTCPublishedCVE List

Public exploit code and templates 1

Auxiliary moduleCisco Catalyst SD-WAN Controller Authentication Bypass 25 Feb 2026Metasploit

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

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.

Text from CVE List

Affected versions 30

Cisco Catalyst SD-WAN Manageraffected: 20.1.12CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.2.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.4CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.5CVE List
Cisco Catalyst SD-WAN Manageraffected: 20.1.1.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 20.1.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.3.0CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.2.2CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.2.099CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.3.6CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.3.7CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.2.0CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.3.8CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.0.0CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.1.0CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.302CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.303CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.2.097CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.2.098CVE List
Cisco Catalyst SD-WAN Manageraffected: 17.2.10CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.3.6.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 19.0.1aCVE List
Cisco Catalyst SD-WAN Manageraffected: 18.2.0CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.3CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 17.2.8CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.3.3.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.4.0CVE List
Cisco Catalyst SD-WAN Manageraffected: 18.3.1CVE List
Cisco Catalyst SD-WAN Manageraffected: 17.2.6CVE List