CRITICAL CISA KEV Actively Exploited

CVE-2026-20127

Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability

CVSS v3

CRITICAL

EPSS Score

54.8 %

exploit probability

CISA KEV

Yes

known exploited

Exploitation

active

SSVC status

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

CISA Known Exploited Vulnerability

Date Added: 2026-02-25
Patch Due Date: 2026-02-27
Ransomware Use: Unknown

Technical details

CVSS v3 Vector: 3.1
Published: 2026-02-25
Last Modified: 2026-02-26
CERT-FR Advisory: CERTFR-2026-ALE-002
CERT-FR Link: CERTFR-2026-ALE-002

Frequently asked questions

What is CVE-2026-20127?

Is CVE-2026-20127 actively exploited?

Yes. CVE-2026-20127 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-02-27.

What is the CVSS score for CVE-2026-20127?

CVE-2026-20127 has a CVSS v3 base score of 10 (CRITICAL severity), with vector string 3.1.

Is CVE-2026-20127 affecting your environment?

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